Tourist visa to earn money?

These foreigners who stay in hotels, guest houses and hosts's residences for couple of weeks earn a huge amount of money through various professions and means and go back to their own countries with their booties.

Many foreign doctors, artists, engineers, actors, actresses are reportedly engaged in such illegal activities.

It is alleged that very recently an Indian astrologer Swami Kishore who lived in a posh guest house in Gulshan, Dhaka, had published advertisement in some of our national dailies attracting many customers. He charged Tk 500/- and above per person for fortune telling, earned a huge amount of money and left for India.

Would the government agencies concerned kindly look into the matter and let us know how far it is permissible and legal for the foreign nationals visiting Bangladesh with tourist visa to earn money in our country and to take away the money to their own country.