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they want you to spend more right now so that you pay more apr. i was 1 month late with a payment and the cc company called me 5 times a day 5 days after the due date.
They want you to think that you have more money to spend than you actually do, and will make a good bit of money on interest when you over extend yourself. If you can control your spending than it is not a large concern, but if not you should expditiously have your limit reduced.
Like RB said I've heard it can be a bad thing to have high limits even if you're not near the max because it leaves the possibility of having more debt if you end up maxing it out.