alright, i have a suggestion. your're not going to like it because it goes against your "never sell speakers" mantra, but you have to admit - it makes a lot of sense. it's obvious that you are curious to hear/experience new speakers, not just short term in a store, but in your home where you can live with them and enjoy them. it's also obvious that long term this won't work, unless you plan on buying a warehouse someday.
so how about you have one (ONE!) pair of "rotating" speakers? you can set an arbitrary time limit (six months, whatever) or even just leave it open. when you start to get the itch again, off to audiogon they go and bring in the new ones. it would satisfy your cravings, save your wallet some and be fun.