[JB4310]

The reason to many cards with large limits are a problem is obvious, they don't want you going out and getting over your head in debt right after they give you a mortgage, which is their most vulnerable time in the life of the loan as that's when there is the least amount of equity in the collateral (house).

I've read where they do credit checks like the day before the closing now and some people are refused the loan at the final hour because they went out and made a large purchase like a car or furniture the week before.