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I don't even ask anymore. My Platinum (with 1.5% cash back) grew from $300 to $8250 but I don't get any BT offers on that card and they have never seen fit to upgrade it to WEMC so there's no point in trying to push the limit any further. I don't need more than $8250 on a card I generally just use for online purchases that I want to use a virtual card number for (like online subscriptions and sites I don't trust).
Capital One is not one of those lenders that I will play the CLI game with because I hate lying and I would have to lie on that form because I know I won't actually use the card anyway.
CapOne is very stingy when it comes to CLI's. I always get the denial because I haven't spent enough. The one I have open now is sitting at 10K and there is no way I will ever come to a 10th of that in any one month.