You’re making a distinction between user submitted WIPs and Choice of Games betas that doesn’t actually exist when you say
You’re volunteering your time in either case, and in either case, if the author of a WIP publishes their game as a Hosted Game, for instance, someone other than you is going to make money somehow.
Also:
Well, you’re getting free access to something that other people will pay money for. Instead of asking you for money, we’re asking you for your time, which is something some of our fans have, in particular, fans that don’t have money but do love to play our games.
It sounds like your preference here would be for us to run our beta testing like a forumgoers’ WIP: i.e., anyone has access to any game in beta, playable, no commitment to give feedback. Unfortunately, that isn’t something we can do.