You seriously underestimate how much money you can make from script development. I wouldn't be surprised if both of them were pulling in $3-5 grand per month.
OT: I feel like this whole idea of an "Official Script" is needlessly complex and really doesn't make sense. Just have script developers agree to relinquish all rights to their work in the event that, I don't know, their script breaks for longer than 30 days. You could then just pawn the script off onto whoever (I'm assuming OSBot isn't ever going to be without at least one developer) and now they have the rights to that script, it's revenue, users, etc.