I had thought the 'spend' for CK's was also dependent upon home airport. At least that's what my buddy who is a CK was told at AA CK meeting in DFW. It makes little sense to hand out more CK's at DFW, when the logical options are limited.
Try flying out of LGA as an EXP, when 10-15 CK's board most flights.
It's confusing to hear how, generally, some CK's don't need the benefits, but are upset they won't 'qualify' again.
Of course not known, but it would be interesting to know how many CK's are based on actual flying/spend vs. those gifted because they are corp execs, celebrities or influence corporate travel decisions.