Yes erle, but in your argument here this would be akin to saying that a COMPLETE Triumph Bonneville America or any of the Triumph air-cooled Twins should cost a lot more than what a H-D 883cc Sportster costs, when in fact they're fairly comparable in price, and even though the Triumphs have to be shipped across the pond to us.
In other words, your "After Market vs Factory comparison" is pretty much an "Apples/Oranges" thing here. And thus, I STILL believe as long as Triumph does NOT attempt to redesign the WHOLE Twin air-cooled line(which I believe there is absolutely NO reason to do, as these bikes possess a very soundly designed rolling chassis as they presently are...well, EXCEPT for those cheap-ass SHOCKS the Triumph factory throws on all the Bonneville line anyway), and just SLIGHTLY redesign the engine so that they're as reliable and sturdy with a larger displacement as the present models are, then I see no reason at all for them to be able to legitimately charge more than that $2K premium for the larger displacement bikes which I mentioned before, AND just about the same "premium" which H-D charges for a new and COMPLETE 1200cc Sportster over their 883cc model.