I mean, regarding this issue, you could just do like EMS cars and prevent people from being able to drive those.. and make sure money is automatically taken from account when you request a ride (I don't know if that's possible, I don't mod).
Overall, it's just a way to add a bit of fresh air to the server, and allow new players to make money in a more interactive way rather than go mine and take the risk of getting robbed every 2 min