Which kind of sales activities can have a negative impact on business?

I will list some from a salesperson perspective in a direct-sales sphere:

1. Using fear as a selling technique (if you don’t buy it or use it, you will risk....)
2. Having derogatory attitude in sale & belittling a customer’s knowledge or critical thinking, to "intimidate" buyers who’re afraid of being viewed as stupid.
3. Using fake fragility to gain a customer’s  sympathy (I’m new here and I may be fired if...)
4. Using too much technical jargon to spin customers’ heads & have them move into buying just to get rid of you!
5. Sticking to a one-fits-all script with all customers

Not re-alocate the sales team to the customer , meaning you MUST make your sales team know all the customers by make re-alocate to the customer , in order what if any sales man left the company ? the the company will loose the customer ? as he / she is the only contact ???