I know the guy pretty well, been a user for a year now.
He didn't like the idea when I presented it to him. He goes after stuff with way more volume and/or innovative algorithms that he finds cool. (like copperlark's keccak or primecoin, yet when I asked about yac he dismissed it quickly

)
Might simply be due to the fact that it has been out for almost a year and only recently begun to be popular.
Anyway not meaning to hijack the thread, lol.
I am seriously considering building a 6-7 card GTX 750 Ti machine... the cost is remarkably low and has a break even almost a month sooner then a brand new 7950*6 build lol.