When in doubt, put yourself in the other person's shoes. If YOU were the dealer and had someone intentionally wasting your time, how would you feel about it? At the very least, you should at least be up-front and OFFER to pay this dealer for the SERVICE of allowing you to audition. Even if it's only $10 or $20, you're at least showing good faith. In all likelihood, the dealer will:
a) kick your butt out on the spot
b) Say it's "no problem", refuse to take your money, and hope they can start a RELATIONSHIP with you so you may consider purchasing other products from them...
Just my humble opinion...