I spent 5 years in sales, 3 years B2C and the last 2 years B2B. B2B was wonderful but B2C was brutal. You had to sell something to everyone who walked through the door, whether it was any good or not, whether they wanted it or not. You either had to quit or hang up your moral scruples on a peg outside the salesroom door. The commission was good so I chose to use the peg.That was exactly my problem when I had the shop in the 1980s. They didn't want an upgrade, they wanted to spend some money, and as I wouldn't take it, as it wasn't necessary, they went elsewhere. Saw this over and again, but my engineering brain set couldn't understand that.
Like Alec Baldwin says in 'Glengarry Glenross' - 'A man does not walk onto the lot unless he wants to buy.' I used to watch that speech every night before I went to bed as it significantly improved my sales. That's not just a movie, sales is really like that. It's not for the faint hearted, you have to be a stone-cold killer, or you'll fail.
It took quite a serious toll on my mental and physical health, in the end I had to quit.