I would say Caveat Emptor - let the buyer beware - to this one! What may be a great idea on the surface of the car may not be so good when you look on the hood.
I've seen a number of these arrangements work out very well, but the keys for that were clear expectations around metrics, responsibilities, and actions. Without those, an arrangement like this is a recipe for a train wreck.
For example, I know of one nonprofit professional association who entered into an agreement to find new members with a telemarketing company. Unfortunately, the contract was not well written, and at the end of the day the Association owed a telemarketing company far more money than it should have and forced it into a near bankruptcy.
My corporate attorney once said that a contract is the "rules of war drawn up in peacetime." If you do decide to enter into an agreement like this, and I am not saying that you shouldn't, be sure that all the details are well spelled out and both sides have a clear understanding of them.
You are entering into a partnership, and a partnership is just like a marriage – are you ready to go the long haul, because that is what it takes for arrangements like this to be successful.