I think Steve said it best - if you come across a good deal on something HERE, either buy it for YOURSELF, or let someone else grab it for their own use. Being "first in line" and buying something from another member with the idea of relisting it here and making a profit that the original owner missed might be a tad shady.
There are lots of great people here of varying income levels and "hobby" money. Great deals are offered here all the time, and although I may see additional profit that the seller does not, it is really cool to see another member get excited because they just got a part/bike that would often have been out of their price range.
I freely admit that I often buy bikes/parts/etc from elsewhere (craigslist, ebay, estate sales, etc) and resell for profit. It is called free market capitalism, and this country is founded upon it. In general it can work out really well for all involved, because my time is worth something and parts/bikes get distributed to people who want them....and around and round we go. Stuff I think people on this forum might appreciate most I offer for sale here. If it sells - great! If not, I move on or lower the price. The buyers let me know either way. Conversely, I also sell only on ebay things that "collectors" tend to appreciate most. Those sales provide profit that allows me to continue to buy and sell.
Notice I said "buy" also. I have purchased many things for myself here from members who were glad I had cash to do so. That's what makes it a COMMUNITY, not simply a MARKET. People are here because (almost always) they LOVE bikes. That love fuels a need to share resources - parts, bikes, cash, etc. Buying and selling is one medium here that allows that exchange of resources to take place.
ANyway, MUCH longer response than I'm sure you required! :roll:
Enjoy this place...it is truly special.