The "500 gil just resets the clock to 24 hours" is a real pain. Either you have to renew *twice* a day (which can be difficult to schedule) or eventually you'll miss and the booth will expire. I understand that they don't want people renewing far into the future to monopolize the booth, but it would be nice if you could get credit up to, say 48 hours; then you could really renew only once a day.