My husband is not only a Z but a Zw. In one way it's handy: in any sort of registration-list situation it's a pretty safe bet that he's the last entry on the list, so easily findable.

The custom in the schools I attended as a child was to seat alphabetically but going front-to-back, not across (so A1 sits in the front position on the left, A2 sits behind A1, etc until you get to the back seat, and then you go to the front position in rank 2 and continue). As a C this often landed me in the back, which definitely didn't work with my vision so then the teacher's nice tidy plan got messed up. What I remember is that after many iterations of this (same school system all the way through), not one teacher pre-emptively gave me that A1 seat and then proceeded normally. Not one.

All that said, I haven't noticed any significant differences between my husband and me with respect to jumping on purchases versus not. What differences there are are more likely to be explained by personality differences -- I am a little more likely to stop shopping when I find something acceptable without hunting down every last option.