People balk at paying $500+ for a scroll saw. It they add what you all want, a cheap saw will start at that price, the middle price saws will be close to Hegner, Hawk prices and who knows what Hegner and Hawk will cost. It is not expensive to add good dust extraction, PVC pipe is cheap. Personally I'd rather add my own. It works good and did not cost me much other that the vac and I need a vac in the shop anyway, so the cost for it doesn't count.
My dust collector, as most has 4" hoses, and to neck that down to a 2" or smaller, it does not work to good. I know I tried it. It is made for 4" pipe. Okay I do not know a lot about dust collectors so maybe there is a way to do it. I'm just saying on a scroll saw,,,, you want to pay more for them??
What the manufactures make available is what they think will sell and they will make a profit. For all but maybe Hawk, Hegner, and PS, it is not a big ticket item. They sell lots more of there other equipment. In the great world of wood tools,,, scroll saw it not a big selling item... we are the minority in the wood working world. Just my opinion.