Prices are not unreasonable. I think this is different from just participating in a clack sale to flip them. He seemed to have quite a collection going, possibly not all bought directly from EK or CC. Maybe he lost interest, maybe he needs the money. Whatever the case, it does not reek of someone trying to exploit the situation.
Would not sell my clacks though. You would have to pry them from my cold dead body. I have to say that I like the idea of waiting and trying to get into legit sales much more than splurging on them, even if it is "just" 50 bucks. Though to be honest, that grey clack looked interesting. I have been meaning to get one of those. I just need something good to trade.