I don't know--I think that someone who has had to resort to eBay prices for a desired piece doesn't have to be called a hypocrite to be frustrated at flippers. In fact, it is those who have been forced to either buy from a flipper or go without an item in their collection who are probably the most violently opposed to flipping, because they have had to pay the price.
A hypocrite would be someone who was an outspoken opponent of flipping, but who then turned around and flipped an item when the money was right. Buying from a flipper and being a flipper aren't exactly the same. They both contribute to the continued existence of flipping, though.
But a hypocrite would be someone who said, "It's wrong to buy from flippers" and then bought from a flipper.
Or a hypocrite would be someone who said, "It's wrong to flip" and then flipped.
But if someone says "It's wrong to flip" and then buys from a flipper, they are not technically hypocritical, but are foolishly furthering the cause to which they are opposed. I would call it cognitive dissonance, but not quite hypocrisy.
I don't like to pay taxes, but I'm not a hypocrite because I do. I would become a hypocrite when I formed my own government and made other people pay me taxes.