Quote from daveyc:
i agree on the settlement risk on the rut if a trader was to hold positions until expiration. with etf's, its risky too, you would then be long or short on the following monday and then you can also have one of those major moves as well, no?
No. Because you can close your position. Your options will be trading at parity!!!!!! You understand that right? In other words, there is no advantage to holding a position that is trading at parity with the underlying. With cash though, the options are trading well over parity. So you either buy them back at a huge premium or take a risk on settlement.