Borgata use COMP $ earned for most/all of their promos.
It seems (like CET) each $5 on non-poker slots played you get 1 comp $--but you must first earn $5 comp before the counter starts to increment.
[Using Free = Bonus slot $, does not count]
I'm guessing you mean Borgota gives one comp dollar for $500 coin-in. CET gives one point (worth 1 cent) for $5 coin-in.