Considering a.o. (1) all the rather negative news and indecision about bitcoin unlimited vs. bitcoin core and the added UASF initiative, (2) the issues that Bitfinex faces with regard to Wells Fargo, I do not understand what keeps the USD/BTC rate on Bitfinex so high, and especially what justifies an increase of the USD/BTC from around 1210 to 1255 as I write this (+/-4% up in a matter of a day). At some point prices shot up when 3000 BTC were traded within 15 minutes. Is there a legit reason for this? Or is it a scam?