YESSSSS. Now if obtaining bitcoins wasn't so cumbersome, sites like this and the bitcoin store would see much higher volume. As an enthusiast, I try to spend BTC whenever I have the opportunity. But in all honesty as the infrastructure for obtaining coins currently stands, it's not worth the hassle of acquiring more to spend. If I made a few coins from arbitrage or tips, sure I would spend them, but when that spare coin wallet is empty, it's back to the plastic in my leather wallet.
As more people generate income in BTC, sites like this will take off. And as sites like this take off, more people will generate income in BTC.
Chicken & the egg... that's why this isn't going to happen over night, but will take some time. However, I think we'll all be happy in the long run!