Ask yourself why this person is selling or giving his advice to you?
If it sounds like a "certain to be rich ride," then why is this person wasting his time on you when he could be out there making "the fortune" for himself?
Of course I'm offering advice here in this site, so let's turn the question on me right now!
What's in it for me?
Well, look up at the top of this page. You'll see who I am! So my obvious motivation is to provide quality information and data in order to "lure" visitors to open a brokerage account with my company, or to buy my "The Stock Market Guide to Profitable Investments" book!
So if someone promises you advice that will yield high returns, and asks you for a price, you should immediately get suspicious!
If this were really true and pay for the advice you'll immediately start getting these high returns! Hey, that would sure be great and I wouldn't have a job anymore!
And if it were true, wouldn't you think that the person trying to sell it to you would forget all about selling and just watch his or her money double or triple every year?
But they're not doing that, which should give you a pretty good idea about where the money's being made, namely from you!
I'm not trying to say that you should never pay for advice, just that you should not overpay for advice. Some advice, especially the sort that comes from books on investments can easily be worth many times their asking price.