Interesting question. I think you could probably get those features by deploying Piku or Dokku for like $4/mo on a VPS, and the equivalent managed Postgres on Render would be like $20/mo (16GB SSD), so something like $6-10 seems like the right range to me. Maybe not a booming business, but a nice margin percentage and worth paying for good UX. And the cheap version doesn't need to be the only version if people want more RAM, etc.

I'd find such a product really appealing, especially with a dedicated backup strategy that uses the SQLite backup API to do hourly snapshots or uses Litestream to S3 by default.