When I was a kid it occurred to me that with the way certain Transformer cars transformed, if there was a person sitting inside at the time, he or she would almost certainly be decapitated.
Jazz and Bumblebee would have given you a ride for the $. In reality though I think Transformers would have no use for puny humans, they would murder us before we got a chance to sit in their hard plastic redundant cockpits. Also, they could store more energy cubes in there (on top of our flattened corpses). Just a thought.