While poverty is a genuine problem in India, begging is more of a menace. A lot of organized gangs use begging as a technique to make money. The money that comes from begging is so much that healthy men and women who can work for a living prefer to adopt this 'occupation'.
In this video by IndiViral , a Delhi University student dresses up as a beggar and begs for alms. The ease at which he earns and the amount of money he makes explains why begging is such a problem in India: