I see many Mortgage and Real Estate Professionals always "Self marketing" and looking for their next deal with their social affairs. Most notably on the children's sports events. My understanding is that some larger churches have such professionals as well.
While these professions require such a work ethic, does it make people grumpy? I often wonder when I talk with an agent that is rude or short with me. Did they do anything to relax? Do they have people that they do not talk business with, just personal events, sports or family? Does their family feel loved by them?
Some people are that way whether they work all the time or not. I do not have statistics, however I think with many people there is a relation between the two.