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can you please tell me how to exchange sp for steem from minnowbooster? whats the process?

You just send steem not steem dollars to minnowbooster here on steemit. The amount of steem gets converted in steempower for one week. If you want it for 4 weeks you put in the memo field: "4". So that's it. The amount of steem transfered dictates the steempower you'd get. 75 steempower for 1 steem. I believe this is the rate :D

But this is not profitable at all. I don't even know if i'm going to recover my "investment".

I need this advice 😀

Here you have it:D