if you trade inside the Ripple Trade System you do not have to Trust anybody to fulfill his promises.
That's correct, you can try to sell your XRP inside Ripple system, but you'll get paid with BTC IOUs, not real BTCs. So you'll have to figure out how to get it out of the system: gateways, trust and stuff. This is not very straightforward, but if you want to play with Ripple, by all means do so.
What I'm offering is a straightforward buy-in program. You get actual BTC to your wallet real fast.
It's not that hard. After you got your BTC IOUs , you can create or login in your Gateway Account ( Bitstamp or Weexchange) get a Ripple Deposit Address and then Send your BTC IOUs to them. From there they are real Bitcoins again ;-)
I cannot get my head around the fact people are paying BTC for a Transaction Currency who is meant to be used up in Creditlines. Ridiculous.