And this is why, despite the efforts of my parents to raise a well-behaved son, I do not answer the phone when I do not recognize the number and directly add "sales executives" people to the junk list.

I do use commercial products, usually because I actually searched for them. I then contact the company, which is usually ready to come and give a presentation.

And then comes the thing which really amazes me. I always tell them very clearly , several times: I do not want to hear any marketing bs or the fact that what they are selling is important. I already know this.

I also tell them I will discuss in very, very deep details such and such topic and I want someone knowledgeable to come or call in.

What amazes me everytime is that they are so surprised when they loose a 5 digit contract because they did everything but what I asked them, and that I end the meeting after 15 minutes.

I know first hand that selling is though. I also know that for such contracts I've need to actually listen to simple requests from a prospective customer.