Also, as I understand, it's actually better not to cancel the cards you sign up for (unless they have an annual fee), because "average age of credit line" is a factor in the FICO score. Snip them up, set up auto-pay and fraud alerts and forget about them, but don't cancel them.

It does not seem like the expected value of the probability of something slipping through the cracks would pay for the marginal increase in the credit score.