No it isn't, and I've never said so. I've created several open source projects which got quite successful without taking money or the intention of taking money and gave maintainance as I saw fit.

"so that you can dig in and fix any issue you feel strongly about."

Trying to fix critical bugs twice, because their was no support, without being able to fix them, I think this often is delusional. Even finding people to pay willing to fix such bugs is a challenge (but we did pay several $10k to people for fixing bugs). But as I've said, YMMV and you might have been able to fix critical bugs in something like the storage backend of MySQL, I probably can't without breaking things.

There is a difference between fixing a missed edge case in a date formatting library or a race condition in a MySQL backend.