@Anonymous, I wouldn't count on a rep to be well versed on things that are decided by the computer. I woudn't blame the rep for that. They simply aren't given the information.
A while back, I asked a second tier Chase rep about how they decide whom to pull. She said, "we've been trying to figure that out." 
Essentially, they were collecting data points and trying to determine patterns just like we do here on the forum.
I havn't had the best of luck with Cap1 either. Most of the time, their CLI's are measly like $300 to $500. I once requested for a larger increase and they declined. I think Cap1 is more interested in having new users with lower CL's, rather then increasing CL's for existing users. The highest CL's I have seen are usually from people that had multiple cards and PC'd/consolidated them into 1. Rarely have I seen Cap1 give large CL's for their cards. (Not counting Venture as I have seen some larger limits.)
Check your prequal page.
Often, new Cap One accounts are much better than your old accounts if your score has increased more than 50 points.
I was denied CLI on both my cards, was prequalified for Venture, applied and got $30,000 @ 13.99% apr the same day as my CLI denials.
It is just the way it is. Research buckets and class ceilings related to Cap One.
