A market price is set by what people are willing to pay for something. I dont think collectors or dealers are willing to pay $50 for a bell system brace or $30 for a 750 chisel. Collectors definately drive up the prices on some things but the vast majority are items that have no user value at all (well maybe except bedrocks and maybe a few other things). Dealers driving up prices, that is insane, a dealer doesnt want to pay market value so you dont have to worry about them. You have the same oppurtunity as a dealer to buy at a low price by frequenting estate sales, auctions, yard sales, and craigslist.
As for selling a Bedrock I find for $25 for $35 ...aint gonna happen. My time and knowledge is worth something. Also have to factor in the gas and sometimes lodging as I travel to buy alot of the things I find. I have been told by some buyers they dont mind paying the markup as their time is more valueable to them than the money.