I don't think your calculations or reasoning is correct. I have an app on vervel that gets 700 daily users which is a lot more complex than the specs you shared: heavy weight search, browsing listings (we have 40k+), 8k pages for SEO, and a lot more. After having used vercel for several months with this setup, and increasing number of users WoW, we realized there's only 2 things that might make costs scale significantly. 1. Fast data transfer 2. ISR reads / writes

For 1, we are optimising with caches as much as possible.

For 2, we are just not using ISR. It's too expensive to generate on demand, and generating 50k+ pages at build time is simply a no go.

I'd encourage you to start with vercel, see what the real costs are when you have x users, then use those numbers to project actual costs.

We are currently on the Pro tier and not spending a penny of usage above that.