I got the card in this Feb with CL $2500.
6 months later, they gave me a $750 CLI.
I used it mostly for BT from Orchard's 28% and CAP1's 25% (APR) when I got the card.
Paid that off in about 3 months.
Then I got a Discover in April with a higher CL.
Maybe they gave me the CLI to entice me to use it more than my Discover.