I initially built if for me. I collected a DB of companies and their customers and wanted to sell it online. I couldn't really find an easy way to do it. If you are interested, I wrote about it here: https://medium.com/@ialuronico/how-to-sell-a-table-d7ec8d01d...
And regarding the price, yes it might be steep. I am open to revising it.
I was thinking that using the tools available now (e.g. Gumroad + Airtable, or Buy me a Coffee + Airtable) it could be competitive. They charge around a 5% fee for each transaction. If you sell a table for $50 they will become more expensive when you have more than 12 users.
If you build this out of no-code tools, e.g. Webflow + Memberstack, their subscriptions should add up to the same amount.