What do you do?

I really start to wonder about some guys.
This has happened more than once. I have blogs, company sites and a lot of information about the work we do. The consulting and services of my company are well defined. They must be! Because we would not have clients otherwise.
Many grown, “professional” men who have been given a complete introduction of me meet me or bump into me in various places. Like a family gathering, someone’s wedding or just my own office. They see my sites. Leave comments and prove to me that they read about my work in some detail.
Then, they turn around and say this: so what do you do?
What the heck???