I would be more concerned with frames being sold for sub 300 USD or large corporations selling frames for sub 1000 USD. Is there that much value added to a custom frame to attract enough buyers to the custom market so that frame-builders can survive?

Incidentally, how much time on average does it take to build a frame and fork? I know it depends on the level of detail (polished lugs, paint, etc..). I can't imagine there is much money left for labour after supplies, consumables, overhead.