Very Simple Crowd Sourcing Websites: Worth it or not?

[h=2]http://jobboy.com/
http://microworkers.com/ and http://minifreelance.com/ (not sure if just a copy or the same company)
http://myeasytask.com/
http://rapidworkers.com/
http://simpleworkers.com/, http://minijobz.com/ and http://www.desklancer.com/ (look also the same)

Preferably: Rapidworkers.com and microworkers.com

These sites you complete simple tasks, sometimes a survey, an email submit, filling out a page, commenting on youtube video, ect. and you usually get paid anywhere from .10 - .50 cents and it takes about 1-3 minutes of your time.

I have just started and made a couple bucks off both rapidworkers and microworkers. I was wondering has anyone made decent money of spending hours on these sites? Anyone make anything worthwhile or are these simple sites just useless?
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i think that best way is to start a campaign and tell the workers to complete a survey for you . If you are able to optimize the offers , do it.. Raise the offers.. Tell to 5 workers to do that and wait for results .. Not more than 5$ spent and you will have results for sure. I used rapidworkers and after 5 hours i had 1 download.. Its worth it