The typical Plus merchant has five checkout-extension apps installed. One for badges. One for upsells. One for address validation. One for fields. One for shipping protection. Each does its job. Each charges $20-$50/month. Each gets updated on its own schedule. Each is a potential point of failure on the biggest sales day of your year.
The dollar math
Add the subscriptions: $12 + $19 + $25 + $39 + $14 = $109/month for the typical stack. Annualized: $1,308. Replace with one Ninja Deluxe install at $99/month: $1,188/year. Saved: $120/year on subscriptions alone, before counting the vendor management overhead.
The vendor math
Five vendors means five support inboxes when something breaks. When Trustpilot widget renders wrong on a specific theme, you're playing ping-pong: 'It's the Trust app's fault.' 'No, it's a theme issue.' 'No, it's another app conflicting.' One vendor cuts the diagnosis time in half — and the fix happens in one place.
The Black Friday math
Every Q4 cycle, one of your five apps will hit a bug under load. Maybe two. The vendors all push updates on different schedules. The probability that all five are stable on Black Friday is the product of each being stable — and 95% × 95% × 95% × 95% × 95% = 77%. One app at 95% is 95%. Eighteen point difference.
The theme-upgrade math
Shopify ships a theme update. One of your five apps doesn't render correctly on the new version. You don't know which one. You spend three hours diagnosing. The agency you hired bills for the hours. One vendor means one upgrade cycle, one set of tests, one deploy.
Consolidation isn't dogma. It's a math problem. The math, when you do it honestly, almost always favors fewer vendors. The only reason most merchants don't consolidate is inertia: the apps are already installed, switching feels risky. Switching takes a Sunday afternoon.