"if we all stop supporting eBay by not selling and also not buying, are the 20% Favoured Powersellers going to trade amongst themselves?"
Nope! Ken, you're absolutely right about who the buyers are. The "big guys" who are selling computers, iPods, and so forth don't buy from other sellers. But "mom and pop," who clean their garages and sell off a few items, will often use their PayPal money to buy something else on ebay. I only buy on ebay when I sell, and that's probably the case for a good many of us. If you break that chain, well, game over. The big guys left standing aren't going to buy iPods from each other.
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Kathy