Who needs a ride from 8pm to 8am? Nobody except drunks. Sure you can send your car out, but you need to plan to get up early every morning to clean the puke out.
Most people follow similar schedules: they go to work at rush hour, ride with co-workers to lunch around noon and then home during the second rush hour. If you are willing to let your car out 6am to 8pm you got some possibilities - but this is when you need/want your car for your own convenience.
Well, drunks, people who work late shifts, people who are going to/from the airport/train station, etc. But definitely not as many as the rush hour crowd.
Most people follow similar schedules: they go to work at rush hour, ride with co-workers to lunch around noon and then home during the second rush hour. If you are willing to let your car out 6am to 8pm you got some possibilities - but this is when you need/want your car for your own convenience.