EDIT: Oh, and someone postulated earlier that I use Kraken. This is not the case. I did for one sale of $100k USD, and found it to be a complete nightmare, to extract the funds.
Why was it a nightmare? How long did it eventually take?
Years ago I read a complaint that they promise unlimited withdrawals, but in reality only allow $50k a year. When I recently checked their site it says they allow $100+ million a year for their top tier. However I haven't had a chance to ask anyone about their experience of a really big withdrawal yet.