The car is the only real value to these missions since they pay $9,000 and $10,000, respectively.
I've done it alone before and was able to save the car in my garage before going to Medrazo's to end the mission. That's no longer possible because when you take the at to the garage now, a message says you can't put a "mission objective" in your garage.
I'm sure the car can still be kept by a second player if you do it with a friend, but since the give money function is turned off, it's not like you can share the score from it.
Edited by AggieBradC34, 16 October 2013 - 10:06 AM.