real cash are actually slower to get, there is no signature that pay in fiat as far as i know
and via trading it's not so different than bitcoin, basically the only difference is real life job that allow iat to be acquired faster, but online bitcoin is acquired faster than fiat
There are on other forums, i remember i saw a marketing forum where there was fiat SC, and it paid via paypal.
But you can always signup to a fiat affiliate program and put that in your signature.
But BTC is just more practical (after all this is a BTC forum, why advertise fiat?)