Do you use your credit card to purchase things online?
I just got back from the bank to change my savings account over to a new savings account, and the guy who helped me noticed that I had purchased lots of stuff online and through paypal the last few months (WR of course!). He says when you use paypal, the person can see your credit limit - and mine is relatively high, at 7-thousand. He says it makes me more prone to ID theft and was trying to convince me to open a separate checking account for my online purchases.
It sounded like a major pain in the ass to me - and I've only ever used my credit card to buy things online. I've been doing it for years. Do you?