TBH I always go on the be polite as well stance (you'll note I said polite refusal first in my post), because I was brought up that way, and also being English I occasionally find myself even wanting to say thank you to the cash machine.
And I really dislike bullies , so have an upvote from me for the sentiment.
But there are certain sort of sales persons who actually try and bully people into passing you through.
They will lie and say they have been talking to the CEO, and threaten you with losing your job if you do not do so, often they will ask your name to take it down. Or they will start with the are you really in a position in the company where you are authorised to do this, you minion technique.
Sometimes they will try it out on newbs I have had working under me, who then feel shitty about falling for it, or worried they have done the wrong thing.
As far as I am concerened those ones are fair game and I have no remorse or mercy.
As for the meetings, it wasn't bullying, the boss would start off by noting the salesmen nice car and shiny rolex which the saleman would be happy to show off, and then make a comment about him not needing to make much bonuses from sales here since he was already doing so well. Then the haggling would start.