Why manufactures don´t burn in their amps and ...

Insist on buying the demo unit from the dealer, if it is in adequate cosmetic condition to you ! With full warranty starting the day you pick it up ( which is usually the case ). Let him break-in the next one !

With all due respect to the tangential discussions above, tje raises an interesting point: Why after paying a phenomenal amount of $ is it incumbent upon the purchaser to perform the break-in? I would think it makes more sense to have this done at the factory level as opposed to a dealer due to warranty ramifcations and the aforementioned stigma associated with buying a "demo'd" unit (versus new) from the dealer.
Couldn't the burn-in serve a dual purpose in terms of flushing out potential defects as well?

The tangential discussions are a reflection of the impacts and unease the buyers are subdued to when purchasing new gear. IMHO, we're still on track here.

OK, the Mrtennis comment goes into the Audiogon Hall of Fame.