Quoted from egyptrus:
Top dollar? It might be easier to sell on pinside as you know that you're likely dealing with another collector who has the same passion for pinball that you do (with a few exceptions like Choggard).
However, I think most of us are looking for great deals and in my opinion great deals and top dollar generally don't go together.
I agree with davewtf. I'm not looking for "Great Deals" if I find one...Fantastic....but all I'm looking for is "Fair Market Value" and I'm happy to pay that and hope to get it when I sell or trade. The bonus of dealing with Pinsider's is you're less likely to get screwed over and more likely to be dealing with a straightforward honest person who has a passion for pinball.