its a free market, people will dictate the price, if other weren't willing to pay then these prices wouldn't sky rocket. You can bid on it if you really want it, risk a single polyp can possibly melt on you the same day or a couple days after you get it, or just wait till more flood the market just like the recent craze on the donatello or other same liked hyped pieces. I've dealt with GB a bunch, he's a good dude and done right for me. would I pay that much for a single polyp, NO. I can buy a whole bunch colonies of non named or good looking Z's and P's for that price. too each to his own.
Same thing happened with Red hornets and other high priced polyp that came after it. Or $3500 single booger of a chalice, MARKETING - P. T. Barnum Its the battle of the Jones'. To be the first one to buy the next new Z's and P's, put their cartoon name on it, get it to propagate first and sell for lots of $$$ before more hit the market. Don't forget when buying on ebay your also competing against stores that want to buy that polyp, put their name on it and sell it online and pimp it on every other forum =)