Domain buying with backordering services like Dropcatch

I think this is my first post here so: Hello to you all! A question is bugging me for some time now.

Am I paying retail prices if bidding on Dropcatch? Is there a margin to be made flipping them in other venues like flippa or afternic? I am seeing domains sold x,xxx on auctions and I am wondering if those people are end users or domainers looking to flip them for profit. Same question would apply for Namejet, for example.

Thank you!