Bahia Mission Bay Corvette show, and what is the difference between all of these?

I do believe the dealership they were purchased at. Other than that, they all seem to be just garaged and cleaned factory stock corvettes that a lot of people bought in order to bring to a show to compare who does a better detailing job. It must be me, I must not get the point in buying the same car as everybody else in my club, like the Miata, Corvette, PT Cruiser, etc etc, club members.

" Gee Bob, is that a Z06?"
" Yup."
" Why, I've got one just like it!"
" With the LT4 and a 6 spd?"
" Exactly."