Citi Credit Limit, Limited: But Why?

Citi makes no sense. Over a year ago, Citi approved me for the Citi Thank You card, now the Strata card. At that time, I had a 2k limit (see Citi’s Pointless 2k Limit Thank You, No Thank You Card). Over a year later, I still have a 2k limit. Every attempt to increase my credit line has been denied. In the interim, I have applied and was approved for the Citi AA Exec Card (Approved! AA Citi Exec 100k). That had a higher limit than my Citi TY card. When the annual fee on that card came due, I attempted to transfer the credit line to my Strata card. Citi claimed that this could not be done because the cards were in different families. I then asked if I could transfer some of my 30k+ credit line from my Citi+ card.

Here’s how that worked out:

As you can see, my credit line was adjusted. Why Citi, why?