So, Ken, if my Denon is 17.7 inches wide, how many wpc is that?
Don't get hung up on specs. I'm sure the Yamaha 1400 is a fine piece of gear, and that Yamaha is no more guilty of creative statistical interpretation than any other manufacturer.
Also, if you have a powered sub and reasonably efficient speakers (like Axioms), you are very unlikely to ever push your receiver to its limits without damaging your hearing. If you regularly listen very loudly, you probably should be looking at separates. For most folks, a good quality receiver is going to have plenty of juice for virtually any application.
