Well the Marwadis and Gujaratis have been traders and businessmen since ancient times. It's kind of like the son of a farmer being a farmer himself. How many daily wage labourers have started their own businesses? Or for that matter, how many IT MNC employees have?

I do not know if there is a bigger proportion of Chinese/Russian/Egyptian businessmen, but I do know that the amount of social stigma attached to leaving a well paying job to do a startup is significantly higher in India than in most other countries.