Just throwing my 2 cents out there as I can
1) Its pretty crappy to post private messages unless there is something really really wrong like a stolen teddy bear sweater. Better to just reference a conversation without calling out someone by name FYI
2) If you thrift/consignment shop/marshalls, etc something and want to sell it for a HUGE profit go for it. If you want to make that huge profit on ebay or styleforum go for it, no ones stopping you. Thats called capitalism and some people will get butt hurt that you are selling your $6 thrifted shirt for $70 but either a) its a good deal and they will buy it as they cant get it for less then $70 anywhere else, b) they will not buy it or c) they will offer you a lower price they feel is fair. Pretty simple.
3) If you buy something from a fellow thrift thread member at a MUCH LOWER price then that member could have gotten on ebay or the B&S as he is doing you a favor, that is pretty crappy to then go and resell it for more. BUT IMO (and I might get lambasted for this) if you pay what someone is asking on the B&S forum classified or ebay where anyone (not thrifters, or "friends of this thread" but people anywhere even not members of this forum) can buy it then you can go and resell it for any price you would like, as if you dont buy it, someone else is going to if the deal is that good. Again this is called capitalism. The idea of flipping a super great deal from a fellow thread member is just wrong. You should offer it back up to the community for what you paid.
PS - DM7 stop crying. This is the Internet.