I've bought bikes from other RB members, and then split them and sold the bits to make a bit of cash. However I've also always told the seller of my intentions BEFORE he sells the bike to me, and I've always offered the price that they're asking for the bike. As far as I'm concerned, what I'm doing is fair enough and I don't particularly worry about or care if it offends a small group of RB members. I don't charge top dollar for the bits I sell. In fact, the vast majority of it is considerably less than "the going rate". As far as I'm concerned (apologies if this sounds a bit self-serving) people like me (there are others on the site) are doing future buyers a small favour by splitting bikes which might otherwise have stayed complete, and by making parts available which other members want for their bikes. My one 'rule' is that I won't buy a completely original, period correct bike, and then intentionally split it. Bikes like that should stay in one piece.
At the end of the day, if the seller isn't happy for me to split the bike, then they could simply have refused to sell it to me in the first place.
However, I think that what I've waffled on about above is different from people who buy a part for one price from a fellow member, and then intentionally try to flog it on for more. But even then, there's a difference between people who have been lucky in that they've bought something for a ridiculously low price, and people who've haggled the the seller down to a low price, and then bumped the price back up when they've come to sell it themselves.
People who intentionally sell items which they've received as karma are the ones who really annoy me
Which reminds me, I should really get in touch with slinky to see what he did with the LTS frame I gave him..!