Has anyone made money using ventures? (like Ad-ventures4u)

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A couple weeks ago, I joined Ad-ventures4u. You can buy ventures for as little as $10 and make money off of it. I haven't bought any ventures yet because I am a little skeptical of it. I've heard you shouldn't pay money to make money. I'm wondering if anyone has made any money off of ventures like a site like Ad-ventures 4u. I would also like to know what your opinion of them is. Do you think they are worthwhile? Or are they a waste of money?