Wahahaha!!! It's hard for me to believe that a person who gets a 100K credit card line and is seeking for advice here??!! Wahahahah...............
If you can make 18% on 10% do it. People who say "dont do this and don't do that" are poor. You got 20 or 30 good years left if your lucky and no matter how much you make or don't make, you can't take any of it with you. So get hot.
you're a real moron if you really try this. I can understand toying with the idea, but that should be about it.
A good day trader can double his money annually, if not more. A confident and experienced trader would not even hesitate to trade on 10% credit. The risk vs return greatly favors the wise trader.