Or, how many telecoms or ISPs you have to choose from in your area? How many banks? Very few, and at least where I live, every one has sketchy people doing sales (particularly over the phone). You can only jump around so much, I bet it averages out for everyone - for each customer telecom A loses because of sketchy sales tactics, it gains a different one that run away from the sketchy sales tactics of telecom B. Meanwhile, they keep pushing win-lose deals on people and rake in the profits.

Here's an incomplete list where I've seen dishonest sales, and expect that the entire market category is thoroughly corrputed by such:

- Cases where you buy something very rarely (like cars or houses).

- Cases where there isn't much choice in the first place (banks, telecoms, ISPs, but also SaaS products).

- Cases where there is a steady flow of new customers, and repeat ones are unlikely (lots of e-commerce, in particular on big e-commerce platforms).