Fine, fine, I'll try to..say... something.... more useful...
1) Not many people like to use receivers specifically for their amp section. If someone's using a receiver, it's because it's an integrated amp with all sorts of tuner abilities etc. However by virtue of being different electronics shoved into a box, it's going to be an inherently flawed device. Remember those old apple computers with "green color" monitors and the giant floppy disk all in one box? Aren't we glad we let monitor companies sell monitors and computer companies sell computers? Granted, it's a bit different in the case of amplifiers, receivers, and processors, but the idea is that each of those things is built for a purpose. In modern day terms, a receiver, even a high end one, is an all-in-one printer equivalent. It just won't print at the level of the best printer, it won't scan at the level of the best printer, and it won't fax at the level of... wait faxing is a joke do people still do this?
2) Now what you seem to be suggesting is using a dated but higher end receiver, but in order to get some features you need, you wish to pair it with a processor to handle modern features like DSP, EQ, and HDMI audio.
The problem with this is that a higher end receiver is still not a higher end amp. Its other sections will introduce noise into the equation. This in turn defeats the silence offered by a great prepro. its amps won't compete with a true separate amp.
What value is using the yamaha for its amplifier when there's better amplifiers out there that are made to amplify.
Replacing a dated receiver with a more modern, more functional receiver makes sense for financial reasons.
Adding a modern processor to a dated receiver will work, but it'll be bottlenecked. That right there is the issue.
If you're trying to save money, go ahead and add a processor and use the yamaha's 6 channel analogue ins. But don't expect to get the most out of the processor purchase.
Now back to your question of "Why sell it instead of doing what you're suggesting."
Because it basically costs the same amount - actually generally less - to get a processor that it does to get a receiver. The value of a processor is only experienced if you've got a wonderful separate amplifier to pair it with, otherwise a brand new receiver, or even a cheap receiver like the Marantz SR5003 refurbs, are just much better bang-for-buck.
Processors are for people who want to go all-out. If you can afford 250 for the yamaha, why not just spend 370 on the
SR5003? You're getting a receiver that can handle anything modern thrown at it outside of height channels and 3D. At least you're getting HDMI 1.3 and the amp section is still robust enough for most people at 90wpc. You're also getting 7 channels of amp instead of 6.
