I do not think that stock removal knives are sold at a premium in comparison to forged knives. To be 100% sure of this I would have to do a lot of research, but from what I have seen, what seems to matter is what the collector is willing to pay for a maker's knives. This can be determined by many factors, but I don't think that how the knife is made has much, if anything to do with it. Other than the fact that most collectors are interested in stainless steel knives. This means that those makers working in stainless steel will have a broader market and will be able to command higher prices, because they can only make so many knives.
Some makers also charge what the market will bear, while others keep their prices below that level. Steve and Deitmar may well price their knives at the upper limit of what they can get, while Jerry and Harvey might be able to get more for theirs.
I doubt that there are very many, if any, collectors out there that believe that they are getting a better made knife if it is made by the stock removal method, and for that reason are willing to pay more.