No different really than dealer pre-selling to other dealers before the public gets a shot at the books. As a collector, it sucks but hey, that's what you get in a free market.
The only time is reaches d-bag levels is when someone claims to only want the comic for their collection, uses some sob story on the seller, and claims they will "never sell" and then they end up flipping it.
This.
I couldn't care less if I sell something to someone and they resell it for a profit. But don't pitch me a story about your dad buying this book for you when you were a kid, and he died in a tragic accident soon after, and this is your forever copy, blah blah blah...
Then next week you see it for sale at 30% more than you had it listed for.
And then we find out the dad is still alive.