Actually $100 USD premium is not that huge amount. However, as long as people is making money then its worth a try.

Current price on Bitfinex: 1420. ATH?
Well, this gets me going. Will it be possible from some of Bitfinex customer, say customer A want to file a lawsuit against them because customer A
cannot withdraw his fiat money from Bitfinex? I'm just finding it filing a lawsuit against Bitfinex is the only way to get your money because they still haven't any resolution yet on the ongoing issue they are facing. No?
People are not making money. If it were possible to withdraw fiat from Bitfinex, there will be no selling at other exchanges.
Everybody would move their bitcoins to Bitfinex. The reason that is not happening, is that it is not possible to withdraw fiat from Bitfinex.
You can apply for fraud. If everyone knows that it is impossible to get money from there, then do not anyone turn to police and to court?