*Puffs figurative pipe and leans back in figurative chair.*
Well, a test server that might consist of only one megagrid or gets reset every week or what have you might just work. It wouldn't need to be exclusive membership, after all. If that where the case, you could even have some cheat tools for this test server- things like decreasing LP costs ten thousand fold, or assuming 100% resurrection- so that high-level features could be tested. Also, it would probably attract the worst elements of the community; no need to macro for weeks to get the black skills, you can just play deathmatch on the test server. Not a bad idea at all. Excuse me...
*Coughs up a lump of figurative lung cancer an inch across.*