Internet scams. How they do it?

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I have been scamed by some sites because I paid to them for getting me some work which would earn me some money on internet. However, I made a blunder by paying them for the same. There are different ways through which you get scamed. On one site I was told that they will offer me many opportunities as a member of their site to work as a freelancer. They offered me just three days only 3$ package. I thought that it was fair enough. So I paid to them. In fact they offered me only advertisements to which I had to apply through their site only. Now I would get the response through their site only. Any during these three days I made as many as 15 applications. But their closing date was only after more than 30 days. So to know if they had selected me or not I had to pay to this site for another 30 days. This was because I would be contacted if selected only through this site only and I do not pay for another 30 days, then I would not know even if I was selected. Now after another 30 days I did not get response from any of the sites...! Who knows any of the advt. was legit or not? The purpose of sending this information and starting this discussion to warn the members about this type of scams. They play around the words and they very smartly get the money out of you. Please share your views on this, especially if you have been scamed, please let others know in detail how you were scamed?