Yeah the costs of adding the extra amps and dacs etc has to be a factor , but you've gotta move pretty fast if you want to pay full list price for an AV amp , seems there is a very nice sweet spot when ,to take TRS's amp as an example you could pay 600 quid for the 818 or a grand for the 828 , a month after the older version dries up you can get the 828 for £699 , and I guess in a few months when the 838 ? comes out it'll be £600 and this is on the high street where you can demo .
I'm betting the list price for a stereo amp is pretty firm for a 3 years or it's longer shelf life.
James