See title.
I constantly feel like any interaction with a sales person is just a big con. Whether it’s a car, insurance, an apartment, internet, or a specialty item that I’m interested in but not an expert on. I always feel completely lost and uncomfortable and like no matter what decision I make I’m making the wrong one.
The time spent figuring out the deal is part of the cost, so unless you came in planning on being unreasonable about the price from the beginning then you didn’t waste their time.