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Mike is right. 

There's nothing really of value on those sites, nothing original or unique.  Even if there is original content (meaning it wasn't scraped) the majority of what they're doing is just capturing a lead you could have caught yourself.

You only have so much time in the day, and for every "free" site you want to post your inventory to - 10 more will pop up before you decide to go home for the day.

In other words, enough of putting your stuff on these "bigger" sites and start building your brand and your relationships on your own, ie. a blog.

When you take the time and create really solid content and lots of useful information you'll begin to build an audience that wants to listen to your opinion and so it all comes down to trust.

Get your RSS reader setup so you can see who's producing really great stuff, and engage with them on their site for awhile and get to know who's who and promote them.  It will come back to you in ways you'd never expect but you have to work hard and be consistent.