imo, as long as you're just grabbing them off the AH, it's fine (which it sounds like this is what you're doing). If you're messaging people and buying via PMs then flipping, yeah, that's more of a dick move.

and honestly, 100-300g isn't really a bad markup either. like at absolute cap that's still only like 1.5x egg price, so who really cares? You take on the risk, you get the profit if it works. I see no reason, as long as it's AH, for it to really matter.