It is cheap. Plenty of us left at the time Wikia became garbage and went independent. It just requires technical know how that most people don't have.
For me - no problem. I have a few side projects and I shell out around 15 - 25 Euros each month.
But I know a lot of people who would love to do stuff like that and have no way of at least being easily reimbursed by the community for their efforts.
A community of 50 people could be financing this with 20 cents each per month.
But as privacy intrusive advertising became the norm no solution ever grew enough to become feasible for the masses.
I remember the flattr button. I used flattr for a while. But in the end I stopped.
tl;dr 10 bucks are not cheap to anybody. I wish easy micropayments were a thing.
I'm aware of this, but you need to keep in mind that we were one of the largest wikis on Wikia (in the top 30 iirc). That's the only reason it cost $10/month.
Most of the wikis on Wikia were tiny, got small traffic, and could have probably been hosted with mine on my VM without even affecting mine.