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I opened a JC Pennys card back in 2008. I was rebuilding - was granted a $400 line. Hit the CLI button every 4 months and received 1 increase a year ago for $50. Yep, my total line was $450 for 3 years.
I hit the luv button today and it jumped to $1800! Now I will actually use it!
Congrats. That's a pretty nice increase.