Well, CCF (= Credit Card Fraud) is possible, and you can get silks for it. But, the thing is, you really need to know A LOT about hiding your IP, making it untraceble, etc, because 1 step wrong, and you can get AT LEAST 5 years in jail. Hacking in the internet can get you 3 years (i.e, downloading a film). CCF is the same as stealing someone's credit card, and using it. Pretty much making you a thief. I wouldn't use it, even for 50 silk xD
It's really that dangerous. Depending on your country law's, you can get high penalties from it. And if your thinking "idc, I'm younger than 18, I can't go to jail", think again. Because the one who is going to pay, are your parents, because they are responsible for you.
Good luck if your planning to do it... You'll need it.