That math only works out nearly that cleanly if you avoid pricing out the engineer time for it. If you’re paying $1M/year in fees, I would be shocked if you do

That math only works out nearly that cleanly if you avoid pricing out the engineer time for it. If you’re paying $1M/year in fees, I would be shocked if you don’t have a whole team to support the open source version. Oncall, system upgrades, the usual stream of tickets about things not working right and people wanting to integrate, etc. I do believe it can be cheaper to self-host, but I really doubt the difference in cost is 2 orders of magnitude. I’d be surprised if it was a single order of magnitude. I would wager it’s less than the sellers profit margins because of economies of scale; I would guess in the range of 10%-20%.