As I said over in the Scrap Yard forum, if you don't have a proxy to buy for you, then dealers (or flippers, which aren't quite the same thing) may be your only chance to buy a knife from a show that you didn't attend. There are expenses when one goes to a show: transportation, possibly lodging, parking/entry fees, sales tax, and time. If you figure in total costs, the markup often isn't as steep as it seems initially. I sometimes (too frequently) sell at "my cost", which is just MSRP + tax or shipping to me + shipping to them. I do that to be a nice guy, but at the same time I also tell myself that my Busse Combat/Swamp Rat/Scrap Yard knives are an investment, and selling at break-even (not even adding in the cost of gas) isn't good investment behavior.
Dealers are folks who sell over a certain threshold volume of knives; I don't recall the volume offhand, but I bet Jaxx knows and might say. It doesn't mean they own a store or a company, just that they sell knives frequently. For Busse Knives, everybody has the same opportunity to buy -- if you had to work, or had family obligations, or decided the show was too far away, then you made a choice to not participate. If, after the fact, you want the benefits of participation, then you should expect to pay a premium for it. At that point it just comes down to how much markup is fair, and as has been pointed out, if you think their price is too high, don't buy from them. The point I'm trying to make is that there are expenses -- if you buy from a 'ganza, expect to add $14.95 for the first knife and $4.00 for each additional for shipping; if you go to a show, there's travel expenses and tax, and in either case, there's an investment of time. If, on top of that, they're sending a package to you, then they're not getting rich by charging more than MSRP, and you make the decision about how much is too much -- if nobody pays the asking price, they'll either have to drop it or hold onto what they're selling forever. Dealers provide a service by making knives available that wouldn't otherwise be unless you go yourself or can get a proxy who scores for you.
The other item, about removing prices from sales threads -- I don't like it, but can't do anything about someone else's post. However, when I buy something from the Exchange, I include the price I'm paying in my "I'll take it" post so that the price remains unless the thread is removed.