I'm sure there are lots of reasons. Addicts always find justifications for their addiction!
OK, there are some cases where it matters, but, IMO, a lot of the reasons are somewhat bogus.
Utilization? As @Horseshoez says, if score is an issue for some reason (before a major app say) you can this time pay all/most cards prior to reporting.
For emergencies? Sure, but what is a sensible limit? An emergency can always cost more so better get some more cards and some CLIs! Plus, paying off those charges is going to be another problem.
Bragging rights? Who on myfico would possibly be impressed by, oh wait.
