My thought was for the times when people are trying to arrange something local (BBQ or RTE etc) and want to see a list of only those members within striking distance, i.e. in the same state. I agree that having your home state in your sig block is useful but not under these circumstances. Anyway it's just a suggestion. It should be relatively easy to do as long as the database with all the member details has a field that says "State", then simply sort on that and filter the output to show only a particular result.
Cheers all
Whizz