30% per annum? Even if this were true (and this sounds quite high, as I mentioned with Gwerns 1% per month estimate) then providing liquidity with them would still be +EV (86% increase vs 30% risk).
Um, did you make your post without actually reading the Bitfinex site about how it works..?
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.