[evanb]

In that case, most people would want to ensure round-trips, though.

[r00fus]

That's not an issue with going to work?

This ride-sharing idea only works if both ends of the trip have sufficient traffic to promote carpooling.

[mikeash]

Within major metro areas there are many options for getting home, from car sharing to regular taxis to busses and trains. The same does not apply to a trip to Tahoe.