It has proven to be a sustainable maintenance fee for me for a while now. It's like a magazine subscription.
I'm grateful for the software and the community and I'm glad I can pay.
There are cheaper alternatives (Ubuntu Studio for one), so that makes it possible for student types to do what they love.
Us paycheck people and pros can afford it. And we do. All in all, it's not THAT expensive of a hobby... and what other hobby rocks like this?