For (hopefully) the last time, AMD doesn't fab any 5xxx gpus anymore. They're done, they were done years ago, they're not going to start again, hence they make $0 off sales of 5xxx series cards. Why then do they care about bitcoin selling cards used at high prices?
AMD is a multi-billion dollar company, with tens or hundreds of millions of dollars going into each fab line, they're ABSOLUTELY NOT going to cater to a tiny cluster of renegade miners who use their cards just fine as they already stand in comparison to the millions of paying gaming customers. Just deal with that.
Of course they aren't going to *cater* to mining. That'd be foolish. It'd also be foolish of them not to see 'Hey, WHY are those 5x series still selling for so much?". AMD is a multi-billion dollar company. And they pay their execs tons of money to get as much marketshare/profit as possible. Bitcoin mining is a part of that.
No it isn't. It seriously just isn't. You don't seem to understand the process so I'll try to simplify it for you. ATI designs and fabricates incredibly complex processors, this costs millions of dollars, it then designs a rich and incredibly intricate architecture to utilize those processors, which costs millions more, producing a "reference board". It produces just those things, then sells off millions of processors and licenses the reference design to manufacturers like sapphire, xfx whoever to produce the cards for retail sale. So when you buy a sapphire 5870 from Electronics-Store #1, or jimbob off the street for $500, AMD doesn't care because it's not selling to you, it's selling to sapphire who sells to the store who sells to you.
So what influences AMD? Marketshare, but share of what market? The gaming market, that has millions of cloying customers wanting the fastest most powerful GPU they can get their hands on, to run the shiniest newest game at the fastest speed possible. AMD is competing directly with NVidia and they need every last bit of their muscle to streamline for this aspect, to keep up with, and maybe even slightly outdo their competition. Any sideline would need to be VERY lucrative to even cause them for one second to give side attention.
There are at best 30-40,000 miners if you look at the numbers, and > 10million gamers. That represents less than one half of one percent of the market for video cards. No one gives a crap about that market segment. Seriously, we've had this discussion a lot before, bitcoin is cool, but lift your head up from the tunnel vision of bitcoin and you'll see how insignificant it is in the scheme of any kind of market share.