That's an image originally from the Barclaycard website someone posted on MF. I can't find its original context on the Barclaycard website, though. It does seem to suggest that when it comes to CLIs, Barclaycard favors people who carry, or at least have report, a moderate balance. If you review your recent charges and PIF more regularly like I do, then Barclaycard make be less likely to give an auto-CLI. In other words, they may favor 20% utilization over 2%, and 2% over 75%.
I'm not saying high balances are good - those are definitely vulnerable to CLDs. But maybe Barclaycard is less likely to give CLIs if they don't expect a customer to use the limit (unless the customer suddenly needs money urgently and becomes a credit risk). After all, I have no good reason to spend more than $250+$250+$750=$1,250 ever on the card in a month.
For people who have had Barclaycard products for more than 6 months, were you having large balances report? Or paying interest? Spending a lot or a little? With CLIs at 6 months or not?
I've had all SM balances report under about 7%, I've spent a few hundred dollars a month on it, and haven't paid interest.