People don't pay for wallpaper, his patrons are not always following this forum. Most of them have discovered his game, played it liked it and decided to become a patron. You need to understand that those patrons are not present from the start, many have canceled their pledge and others have just started.
And 700/m are very far to be enough to live out of it. I guess he was quite disapointed that after having done such a good game he did not get as much patrons as some bullshit games that have thousands, so he has to work and has not much time and courage to work on that game. He has stated once that he was hoping for a better support but even if his game is very good it's certainly not the kind of game that most of the teenagers who are on this forum like the most.
But why are you so annoyed that people still pay him for wallpapers, do you have to give them the money maybe?
I have been his parton for a few month, i guess i have payed twice 5$ then 1$ a month for a while and i have canceled it now as there is no new content.
That's my rule, i'm ok to pay 10-20$ for that kind of game if it's very good but certainly not more, if there are some patrons who pay 20$ a month during two years that's their problem, i don't give a shit!