I've been with Shutterstock since June 2006. I'm making reasonable money on it: $400-900/month. That said, I have a significant gallery, 4000+ clips. As well Shutterstock Footage is still effectively in 'beta' mode. I expect in the near future that the dam will burst. I've looked at many other microstock footage sites, none appealed to me. Why? Because at $1-10 commision per clip it's not worth my time. Shutterstock pays $30 per SD clip at full resolution, I sell 90% full resloution. HD is even better. Effectively it makes me exclusive at Shutterstock. In time, customer will look for my clips there and no where else, guaranteeing a certain amount of sales.

Yes, 4000 clips sounds like a lt of work, but it's worth it. I've been shooting for well over 20 years, I've got a pretty back-library to cull material from. I also spend at least 1 day a week in the winter and 3 days a week spring-summer-fall shooting. There is no short cut to success.

My advice is look carefully at all the footage sites, find what you feel is worth your time and stick with it. There's no point uploading to several differnt sites if one the sites is paying far less. You're only competing with yourself.

cheers
Francois