It is not all that easy... =) I did it for about 3 months a few years back. It was fun for about the first week, then it got really boring and tedious.
They try and offer you a number of projects you can work on, so you can mix your time up... But for folks like most of us (webmasters) you might find the work very boring after a while.
For the pay, it was not worth it to me to keep the job. Of course at the time I was working a full-time job (corporate america), running my websites AND doing the Quality Rater job... that could have been why I had no time for it.
Perhaps now that I no longer work in corporate america it would serve as a nice mind-numbing escape for a few hours a day... ;-)