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!

Domain buying with backordering services like Dropcatch