There are other possibilities for individuals:
"Monthly: GitHub Sponsors, Paypal, Patreon, Liberapay"
"Once: Stripe, Bitcoin, Paypal"
And also "for non-profit foundations and companies."
Thanks!
Unfortunately it is up to open source developers themselves to set their business model, and many don't seem to like (or want to do the work of) setting up overtly commercial relationships like support contracts.
We're not a very big company, could easily afford 1k a month though, but then it becomes an actual sum that's harder to motivate as we're mainly working with MS products.
I don't know if it's fair to say he's not making what he asks for.. or basing a 1/10th claim without knowing how much he gets from other sources. (Bronze/gold partnerships GitHub donations, stripe, crypto donations, and some others).