Nice to be able to "walk". But sometimes you want to buy a car, there are limited dealer locations, and I deal with it. I usually plan to "buy here service here".I'd walk as soon as that was brought up.
Many 'ships have moved earnest money to coincide with signing the initial yellow paper contract before the finance office. A somewhat easier pill to swallow. A down payment of sorts - in case things go awry in the back room?
Then there is the sequestering of your "trade-in keys" That's an oldie but goodie. Lol.