I would if I just happened to come across the posting and just happened to have paper and a sharpie and a digital camera next to me.
It's interesting to read all the comments that say "$1?!?! You're ripping off these people! Why would anyone ever do anything on Mechanical Turk?" How many hours do y'all spend on Hacker News? How long did it take you to write those comments? How much were you paid for it?
In strictly economic terms, Turkers are getting ripped off a lot less than news.YCers are. After all, $1 is infinitely more than $0. We labor for free so that Paul Graham can have a viable online community and pick of the top posters for his seed capital firm.