in short ... if you accepted or sell crypto-currency ... you will be banned (delete items and no refund of the pay for item presentation).
you can sell crypto-currency miner ... but with "real currency" (sic!) ... wire, paypal, etcs ...
Are you sure? I don't think it's been like that for a while. There's plenty of crypto currency for sale. They even allowed it a while back. There's still a big problem with charge backs for digital currency though as they dont cover digital goods and tend to ignore blockchain proof.