Because btc.sx isn't anywhere near as fraudulent as gox itself, and its hard as fck to get a fiat loan on Gox itself, and it would be stupid to borrow fiat and promptly exchange it for devalued gox bux?
In a way you are planning to do just that, only you borrow the fiat with worse conditions.
You're borrowing Gox Fiat, at Gox Fiat collateral rates, with a promise of repaying Gox fiat. Not borrowing real fiat and exchanging it for Gox fiat.
But then do you expect to see anything of these "funds" in any useable form again?
I dont care, I don't intend to do anything with gox fiat except occasionally owe it.