I just get ticked off at the quick flips that are obviously not pinball hobbyists, who buy a game local just because they are quick and then post it up with a ridiculous high price on EBay or CL shortly afterwards, and it just sits out there. This has an impact that ripples through the hobby: Folks with a proper budget for a *fairly* priced game are now shut off from that title, since not only can't they get that particular flip, but then others see the asking price and expect more - so they raise theirs.
Sellers with the same game or have deep pockets will scoff that it's no problem, that they should be able to sell at whatever they want. The small budget hobbyist that is a potential buyer is the one that gets frustrated.