That's what I don't get. If you want to flip mods and make a profit OR to fund the purchase of other hiked up mods, that's okay... I mean it's not, not in my personal view, but that doesn't mean much: it's a free country, you are free to do asinine things.
What I don't understand is why do these people try so hard to both have their cake and eat it, too. I mean: you're doing the "capitalist" thing and do not accept the "nice", "communitarian" way. That's your choice. But have the freaking balls to stand by your choice. You are doing something that some people consider amoral. But you have made a choice, and you obviously do not share the same moral compass as those some people. Get over it. You can't please everyone, and sometimes your choices reflect on your character or reveal your character in ways that you won't like. Stop trying to justify your actions - it makes it worse. It says that you do get the moral reasoning behind those who shun you for profiteering. That, in turn, moves you from the amoral territory in the immoral one. When you do care about a certain type of moral judgement, and you still chose to act against it, you are by leaps and bounds worse than when your own moral judgement simply differs, or is absent, in a way that allows you to act that way.
/rant
(in fact I understand, it is a typical immature behavior whereby you are entitled at all times to both do what you want and be liked by everyone around)