It is a shame when people charge over the odds for parts etc.....but people don't have to buy these things.
I have bought many parts from Graham at FBI......why? you ask, he often has them on the shelf and in good condition
I now have the privilege of a bit of experience and a cool website, where people help out and generally sell things at reasonable prices. I think it is sensible to post wanted adds and see what comes up. If a dealer sees it they can ask their price if your average Joe has the part in their garage they can offer it up at their price.
I have made a bit of money over the years by buying something cheap, doing it up and selling it on, if that were a business I would have made a loss but I enjoy it. I also buy things then decide I don't need them or can't justify the cost and sell them on, either at what I paid or less.
It is a great scene where if you look and ask around there is always someone to help.
BUT......Don't forget that the dealers/traders keep the scene alive, because without their risk taking and investment it would be very hard to get some of those much needed parts. Don't put them down too much, but let them know if they are taking the P***.