When evaluating ad effectiveness, most marketers compare Cost per View or CPM. But with Type A DOOH on Dropfoods Smart Vending, the metric that truly matters is Cost per Purchase — the cost to generate an actual purchase transaction. This article directly compares Dropfoods DOOH ROI with Facebook, Google, and YouTube using real campaign data: 7,040 Verified Purchases at just 3,636 VND per purchase.
1. The Real Cost Question — "Cost per View" or "Cost per Purchase"?
The ad market typically compares via CPM (Cost per 1,000 Impressions) or CPV (Cost per View). By this measure, DOOH looks "more expensive" than digital — since DOOH CPM is usually higher than YouTube or Facebook.
But this is the wrong question.
The right question is: "How much does it cost for a customer to actually BUY the product?" — i.e., Cost per Purchase. And when compared on this metric, the results completely flip:
- Digital ads: View → Click → Landing page → Add to cart → Checkout → Payment. Each step loses 50–95% of users. Final conversion rate: 1–5%.
- Dropfoods DOOH Type A: Watch video → Buy right at the machine. Zero intermediate steps. 100% VCR (Video Completion Rate) for Verified Views.
🎯 Critical Insight
Don't compare "cost per view" — compare "cost per purchase." This is the only metric that reveals whether ads actually drive revenue or just generate impressions.
2. Real Case Study: 7,040 Verified Purchases at 3,636 VND/purchase
Data from a Type A DOOH campaign on 100+ machines, spanning 48 days.
| Metric | Result (48 days) | Notes |
|---|---|---|
| 🥉 D-Spots | 5,466,932 | Continuous play 15h/day, unskippable |
| 🥈 Interacted | 542 | Direct ad clicks |
| 📹 Verified Views | 8,233 | Mandatory brand video at payment (100% VCR) |
| 🥇 Verified Purchases | 7,040 | Watched video → bought at machine |
| Machine Revenue | 70,596,000 VND | Avg ~10,028 VND/product |
| Cost per Purchase | 3,636 VND | Net cost / 7,040 purchases |
3. Direct Comparison: Dropfoods vs Facebook vs YouTube vs Google
Cost per Purchase — the only metric that proves ads drive real revenue.
| Channel | Cost per Purchase (VND) | vs Dropfoods |
|---|---|---|
| Dropfoods DOOH Type A | 3,636 | — (baseline) |
| Google Ads → Purchase | 30,000 – 150,000 | 8–41× more expensive |
| Facebook Ads → Purchase | 50,000 – 200,000 | 14–55× more expensive |
| YouTube Ads → Purchase | 70,000 – 300,000 | 19–82× more expensive |
⭐ The Killing Point for Pitches
Dropfoods DOOH is 14–82× cheaper than digital ads when comparing cost per purchase. Reason: the distance from "seeing the ad" to "buying the product" on Dropfoods = zero intermediate steps. Digital requires 5–7 steps (click → LP → cart → checkout → payment) and each step loses 50–95% of users.
4. Why 92% of Buyers DON'T Click the Ad
The Brand Awareness Effect — more powerful than clicks.
In our case study, only 542 people clicked directly on the ad, but 8,233 people watched the mandatory brand video at payment and 7,040 people bought products. View-to-Purchase conversion = 85.5%.
This means: 92% of buyers never clicked the ad. They didn't need to click — they watched the video repeatedly in the loop cycle (~675 spots/machine/day), remembered the brand, and when standing at the machine → chose to buy. Moreover, at the payment stage, the brand video plays mandatorily with 100% VCR — guaranteeing brand message delivery to actual buyers.
This is the Brand Awareness Effect — the phenomenon that billboards and traditional DOOH claim but can't prove. With Dropfoods, you have concrete evidence:
- Loop Effect: Video plays 675 times/machine/day → cumulative brand recall
- Point-of-Purchase: Buyers remember the brand → select the product right at the machine
- Measurable: 8,233 Verified Views → 7,040 purchases = 85.5% conversion = proof that brand awareness drives sales
🧠 Insight for Marketers
If your brand sells FMCG products — don't expect people to click ads. Hope they remember your brand and buy. Dropfoods Type A DOOH lets you measure exactly this.
5. Dropfoods DOOH Benchmark — vs Industry Standards
| Metric | Dropfoods | Industry Standard | Rating |
|---|---|---|---|
| Cost per Purchase | 3,636 VND | Digital: 30K–300K VND | 🟢 14–82× cheaper |
| Verified View Rate | 0.129% (spot → purchase) | Digital: 0.01–0.05% | 🟢 2.6–13× higher |
| View → Purchase Rate | 85.5% (8,233 → 7,040) | Digital: 1–5% | 🟢 17–85× higher |
| Ambient CPM | 40K–60K VND | DOOH VN: 65K–105K VND | 🟢 30–40% lower |
| Click Rate (passive) | 0.0099% | DOOH loop: 0.01–0.05% | 🟡 Normal |
| Closed-loop measurement | ✅ Yes (Type A) | ❌ No (traditional DOOH) | 🟢 Unique |
🏆 Bottom Line
Dropfoods Type A DOOH isn't the "cheapest DOOH" — it's the "highest ROI DOOH" thanks to closed-loop measurement at point-of-purchase. When the most important metric is "how many people actually bought," Dropfoods wins by 14–82× versus digital.
6. Start Measuring What Really Matters
If you're spending on ads but don't know how many people actually buy, it's time to try a new way of measuring.
🚀 Register for an Ads Pilot — Measure Real Cost per Purchase
Run a pilot on 10+ machines for 1 month. Get detailed reports on D-Spots, Interactions, and Verified Purchases.
Register Now →📊 For Agencies:
- Pitch support: Case study data + benchmark deck ready for agency use when pitching clients.
- ROI calculator: Tool to estimate Cost per Purchase based on machine count, cluster, and budget.
- Partnership: Attractive commission for agencies introducing clients.
Contact Dropfoods Vietnam
Address: 34 Lê Duẩn, Phường Sài Gòn, TP. Hồ Chí Minh. (Monday - Friday: 8:30 am - 5:30 pm)
Phone: (84) 028 6290 6066
Email: contact@dropfoods.com
Facebook: https://www.facebook.com/maybanhangdropfoods
Website: https://www.dropfoods.com
