Spoiler I've heard something along the lines of if Benny escapes first of all from Tops you will find him been taken hostage or something by the Great Khans. I don't know what happens to Benny when you find him though.
Thanks again Marine. I have seen what happens when Benny escapes (and I recommend it on your next playthrough; it's interesting!). gamenut6870 has it right.
And thanks gamenut6870, but I'm not trying to get Maria. I was looking for a way to get the Platinum Chip without resorting to violence. The only way to get it at the Tops is by using violence, so the only nonviolent response is to let Benny escape the Tops. If Benny escapes the Tops, you can catch up with him later, but again, that ends in violence no matter what you do.