OP, as others have said in the thread, they like to actually see activity. Not a lot, but it really helps. I have a Jared's card that I opened in 2009 IIRC. Jared's is a sister card to Kay's, they are both Sterling Jewelers accounts. Started out around $5k (almost certain it was $5k, it was a long time ago). It is now $15,000. I have purchased a few things here and there for my family for Christmas and the only CLI I had to ask for was the last one - because I made a larger purchase and didn't want to use up a huge percentage of my line.
If you aren't using it at all, they won't give you large increases.
Having said that, if you actually went to the store and provided income information and they only came back with $100s - that speaks more to your income because your scores are certainly good enough. I am assuming your scores are FICO 08 and not the credit scores from the individual CRAs. Hard to tell from your signature.
