Donate €20 and the ads are gone. I have a few payed extensions on my forum. If they are good, and I need them, then why not... Also don't forget that the arcade ext is very large and hard to code. Takes very very long time to create and update such extensions.
I donate €20 for 6 months without adds. That's not much.
And you have quality games @ KillBill! I downloaded lots of games from Relax arcade & Thunder and I had to delete them all. Bad scrips, the games broke the SSL, and lots of adds in the games. So "JV Arcade" is the best one.