but always increase your available whenever you can.
Doesn't this hurt you by causing you to have too much total available credit, when you go to get a loan?
on opposite day
Ok, here's the thing (and I hope you don't mind me getting academic about this...)
Throwing impracticalities out the window, if a credit card company offered you a billion dollar line of credit, do you take it? Sure, it might help your credit score, but who really cares if you already have excellent credit? (At least IME, there isn't a difference between like a 770 and a 820, at least when it comes to getting a loan for a house.) So, what's the other upside? Ok, you could spend a billion dollars, I guess. That's an upside, but you probably won't ever do that. Any other upsides?
Now risks. Fraud. Someone fraudulently spends a billion dollars on your account. And while you may be "protected," I think the headache of dealing with all that stress would outweigh the benefits of some minor perceived credit score bump. Anyway, generally speaking yes take those increases in line of credit, but there is a limit where the risk outweighs the reward. You should know where that is before go beyond it.