^ I don't know if I agree with what you are saying 100%, but i certainly understand your point.
When I buy as a collector, I pay more than I do as a dealer. Of course I am always looking for a deal. Since Den is buying for his own collection, I agree, his offers could be better and he will obtain some nice pieces for his collection.
However, when I buy as a dealer, his point of view is accurate. The listing on Ebay and dealing with shipping and paying the fees....most people don't want to deal with that & if they can get half of what Ebay prices are they will take it. All at once and no hassles. Some people are like yourself and more computer savvy and willing to take the time to make the extra 25% (with the fees taken out). Most aren't.
I don't think his offers were unreasonable. Sure, he can offer more, but why start too high? Haggling is what it's all about.