I've got two rigs of 570's that I have basically dismantled. Whilst I could run them for the sake of it, at 16ct/kwh it's a zero-sum game. If someone rocked up giving me £50 for each 570 I'd give them the whole batch (14 of'em).
That should sell instantly, have you considered listing locally?
Recently I've also let go of some 1060s for 140 USD and a 1080ti for 490 USD, they were brand new rma replacements. 1080tis ended up being the best bang for buck after counting for depreciation.
EDIT: OHMYGOD what does it take to hit legendary?!
1000 merit points which is tough to do.
I gave 3 to you just now.
My 1060 6GB's have been pretty solid for a good time too, but with new cards and OC discoveries, they're also losing rank to more efficient cards. At 11c/kWh they'll be profitable until their revenue hits about $0.28/day. I'm going to keep a couple of my prime cards, but sell off the undesirables, and use the money to consolidate with more powerful gear. 
As for usdt isnt under investigation bitfinex is.Bitfinex those 800+ mill wasnt stolen but instead it was seized by 4-5 countries so they might get them back when they produce correct set of pappers(if they can)similar thing already happened with usdt when it was traded 90c on 1$ few months ago and now you can even margin trade usdt.Bittfinex getting rekt wouldnt be such a big deal since their volume is low and geting lower every month(rank 48 on cmc)people are already pulling out from exchange(over 100k btc moved from bitfinex cold wallet in last day)