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There is an internal market?

Yes, at https://steemit.com/market.
You can find it in your wallet if you click on the sum of your SP (when you Power up or Transfer) and you have "Market" at the bottom.

I can't see myself use this either, they take a cut out of it and why should they make money on me when I can just not pay someone for doing what I do myself?? INSANE! :D