I also, like everyone else, have run into less than desirable salesman. But every now and then. No matter what the product, you do find one that, knows what he is talking about. Is out to make a fair profit, and not abuse the customer. Those guys are worth their weight in gold. And have been of great benefit to me. Which is probably why that type tends to be very successful.
So I don't think all sales folk should be painted with the same brush. Some are pretty darn good and helpful. And of great benefit to the customer.