That's correct, if you're going to pull your car like that every day - some day the rope will break.
Great method for an emergencies!
Regarding the friction. It grows linearly with every bent section of the rope, but each pulley, after the first one (the post), divides the necessary pulling force by 2(so it's exponential). The exponent function grows faster than a linear one. So, the benefit of such a rope system over a single post pulley should be noticeable.
Check these basics of elementary physics involved:
http://www.howstuffworks.com/pulley.htm