just a question (I couldn't follow all the forums lately): why is there such a huge spread between bitstamp and bitfinex?
See the answer above, also a problem is that Bitfinex can only really send money in batches, and these are gobbled up FAST. Looking at the outstanding loans, they grew from 1-2 million pre-bubble to now about 3.5 milllion tops. That would mean a lot of that was sent to Bitstamp.
Likely they send 6-digit amounts of USD each day and people still buy that up like crazy, since borrowing that money is so cheap. Before prices for borrowing can go up, the USD dry up for the rest of the day - rinse and repeat. Also this leads to price swings (as the price crashes on Bitfinex internal at Bitstamp deposits) that liquidates some thin positions, blowing more USD to be lent out on the lending market, which then gets eaten and used on Bitstamp mostly again - making it necessary to move more funds there.
By the way, a message to people apparently re-posting their loans at 33% APR: You are NOT smart. Not at all. Please at least use FRR or just let the money sit at 400+% for a day or so, I had offers taken from time to time that were far above and beyond FRR. As long as this gets taken one in 10 days, you still make a profit compared to these lowballing offers. Also right now there is no lending as there is no margin trade.
Edit: Wow, just as I write margin trading is re-enabled and lending rates shoot up to 300%+