I honestly don't know how many off hand. 10 minimum, add all store cards in though 'target,sears x2,kohls, and a few others' somewhere around 20+
Well personally none thankfully I don't like digging myself a giant hole of debt which everyone seems to do with credit cards. Then obviously my company has it's own credit card to pay for expenses but it is just a necessity online and not used to buy things on credit.
I've got two, one's just a backup card, and the other I use for everything... Never carry any cash around on me... Also, why pay cash, when you can get skymiles for paying with a cash... And I'm good with money, so I never spend more then I should just because it's on plastic...