Being around these forums for quite some time, I see a lot of people love to use Yamaha's and Denon's as pre-amps and add external amps. Why don't Yamaha or Denon make a few models (1500, 2500, 2805, 3805) without the power supply? The unit could be smaller and therefore more manageable since there will be another piece in the rack. Also, the price could be lower.
I doubt having all models like this would be good because the budget models usually are bought due to budgets...those buyers wouldn't want to purchase separates. Doesn't seem like this idea would cost these companies much more money and could sell a decent number of units.
I don't know. Just a thought.