I can't really decide if I'm BU but really keen to hear other people's thoughts.
I'm part of several local selling sites on FB. I've both bought from them and sold on them. Recently, I noticed that one woman had purchased something from one site and immediately (read 'next morning') sold it on another for a rather elevated price (still cheaper than a new one). I've since see her do it repeatedly. She sells a lot on the site...I've bought something previously (a highchair that turned out to be naff and I ended up giving it away for free, but that's not really relevant). She's pretty much always online either bartering or selling. She's frequently the first to jump in pretty much straight away and buy the very good bargains within minutes of them being posted.
Anyway, I mentioned it to a friend of mine and apparently this woman makes a lot of money doing this. She also bulk buys stuff and sells them separately occasionally (fine in my opinion). The friend who told me this knows the woman well...it's a small isolated town that you can walk the full length of in 15 minutes so pretty much everyone knows everyone else at least through a friend.
AIBU to think that it's not really on to monopolize all the bargains on a site before others get much chance and sell it on at an elevated price?