Is it such a big deal?
With that said; PLEASE be careful about where you obtain and purchase cars from, that do not have a title and demand a bill of sale that can be notarized, with a copy of the seller's driver's license, for your own protection and have a notary stamp it in front of both of you.
I have seen people lose out on cars, rightfully, because of current owners claiming property on sold vehicles. At that point, its your dollar in claims court versus their ownership and any proof that you have, so be sure that you have court admissible documentation before handing over any cash or accepting any bill of sale or any part of the car. I can't stress this enough.
It protects you from criminal activity, puts property in the rightful possession and keeps you from losing money, or at least gives you the ability to pursue it in civil court against fraudulent sales.