Itza, the term "free shares" is often used and is not an illusion. Let me put it to you this way: One day Mr. Crab sends Sponge Bob to the market to buy some bread crumbs for the deluxe crabbie patties. Bob takes his financial advisor Patrick with him because Gary has the sniffles that morning. Bob gets to the market late because Patrick has a intestinal problem. The only bread crumb stand that is still open has 4 cases of bread crumbs left to sell. The store clerk tells Bob if he is willing to buy all 4 cases, he'll sell them to him at half price. As soon as Patrick comes out of the store bathroom he advises Bob to "take the deal" So Bob buys all 4, even though he really only needed 2 cases. On the way out of the market, Bob runs into Mr. Crab's number one competitor, Chuckie Tuna. Chuckie had taken a long nap that day and also got to the market late. He also wanted bread crumbs at the market. Patrick speaks up and tells the Chuckster that they might be willing to sell him 2 cases if the price is right. Chuckie ( being a bit desparate ) said he'd be willing to pay double the going rate. "Done Deal" So Bob ends up with 2 cases of bread crumbs and twice the amount of money he left home with. So on the way home he and Patrick stop at Sharkies for a couple frosties and to celebrate their "free crumbs"
Hope this helps to explain.