I was interested in checking this out until you mentioned driver is paid at most $0.54 per mile. That really stinks for city travel where commute times are long and parking at the downtown destinations is expensive. There is no incentive for me to pick up a carpooler on my 30 minute 6 mile drive into the city where parking costs $26/day. In rush hour traffic, it'll easily add an extra 15-20 minutes to my commute each way to pick anyone up.

It would subsidize $6.50 of my parking but I'd end up with an extra 30-40m of driving each day. Perhaps it's better than nothing?