Flying standby on Airtran

Has anyone had luck flying standby on Airtran? We have an afternoon flight booked from Milwaukee to Las Vegas but we were thinking of trying to fly out on the earlier flight.
The last time I tried with them they wanted $50 per.
Bob
Really? Website says $25 per. I'm just not sure if it is worth a shot or not cuz we have 1 1/2 hour drive to airport and don't really want to be stuck there all day until the afternoon flight if we can't get on the earlier one.
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