I seem to recall the same thing happened with Gox.  It had a higher price than other exchanges at the time, so people kept pumping money in thinking there would be a tidy profit at the end.  Obviously it didn't turn out to be the best strategy, heh.  Hopefully it's just a coincidence and history isn't repeating itself.  But I'd still recommend people play it safe and withdraw via BTC or alt, at least until Bitfinex appears to be on surer footing.