I think a lot of people have those kinds of days, full time employment or not. Turking is...kinda exhausting, honestly. Because it requires you to be consistently engaged. Most jobs have predictable periods of downtime- you know when you get a break, and you know when you get to go home. The random nature of Mturk can burn you out. Or it can really energize you, I guess it depends on your personality.
I used to have people ask me about Mturk and I would try to help them get in to it, but it was always a failure. Too many people get thrown off by the microlabor concept. If you're used to thinking about your earnings in terms of hourly rate, 5 cents per task doesn't translate well, even if each task takes 10 seconds. I've had actual conversations with people where I told them I make 30 cents a minute and they thought it sounded like a BAD pay rate. Retraining your brain to think in terms of pay per minute is hard.
All the scripts and stuff and the diversity of forums and guides and things makes the whole landscape easier to navigate, so fewer people are getting turned off by that initial hurdle of getting numbers.
I guess the only down side is that a lot of people are developing over reliance on scripts and stuff... I wanna bang my cane and yell "BACK IN MY DAY WE HAD TO ACCEPT OUR HITS MANUALLY! AND WE LIKED IT!"