Huzzaa! A sign that the economy is recovering!
Seriously, this is only a (small, marginal) benefit to your credit. So long as it does not tempt you to spend more, let them raise the limit all they like. Get on with the business of life.
"There are three kinds of men. The one that learns by reading. The few who learn by observation. The rest have to pee on the electric fence for themselves."
- Will Rogers