Why not? if you look at an actual review with numbers - it's really not as clear cut that this is inferior. The 6850K will use a little more power at full wack but would beat an 1800X in a number of interesting benchmarks (check anandtech they have a good review). Buying older hardware has always been interesting and makes choices more fun - you still get the warranty from purchase time so I don't really see the issue if it fits your need? And in a few years time pick up a 6900K or 6950K second hand when they're being dumped and upgrade to 8 or 10cores...
Choosing a CPU that is best for you is way more complex than just core count, gaming benchmarks and clockspeed. Unless you're contributing to opensource software to improve AMD support I seriously doubt you peddling CPUs on a forum is going to make a difference. Buying for idealistic reasons is great but maybe not what the OP wants
If it makes you feel better buying EOLd stock on huge discount is "sticking it to the man!" as pretty sure it's been dumped at a loss - although not sure if it's Intel, OCUK or the distie loosing in this case...