Marginal trading is another tough lesson to learn if your not careful. I'm glad I caught on to the concept in my earlier trading days. Don't get me wrong with marginal trading as it does have some good value to it. It's just that when it's time to collect from the trades, the bulk of the money goes to the actual lender. It gets tricky so just be sure to overlook the terms before engaging.
RE: Black Friday - Altcoins Off!