Who are these hotdog salesmen who are grandmasters?
Who can become a grandmaster?

The notion that chess is a diversion for math wizards or a refuge for eccentrics is a misconception. The ranks of the grandmaster player are filled with all manner of people, from musicians to hot-dog salesmen. – Roger Langen
Well, possible.
However, one thing is sure: you need to be a genius to be a GM
Even IMs are genii
The notion that chess is a diversion for math wizards or a refuge for eccentrics is a misconception. The ranks of the grandmaster player are filled with all manner of people, from musicians to hot-dog salesmen. – Roger Langen