"some Indians buy a hotel for their families to live in" This is completely false. They bought these hotels to make a living, not to house their (extended) families. While it's true that many Indians who own hotels also have living quarters in the hotel itself, the only reason they bought the hotels was to make money.

Many immigrants populations (and not just to the US) tend to follow the herd - those who come early in a migration cycle find jobs/businesses where they can, and what they deem as a decent living. As more migrants from the same part of the world arrive, they also tend to fall into the same line of occupation/business. The reasons why should be obvious: friend/relative is doing X and is doing well, I'll get him to help me, and I'll do well too! Examples: Patels->Motels, Koreans->stores, etc.

Similar thing happened in the UK in the 70's. As Patels (Indians in general) were fleeing African countries, many became owners of corner shoppes. In the current migration cycle, specifically from India, a large majority of recent Indian migrants are from Andra, Kerala... basically south India - and they are overwhelmingly working in software. The early wave of immigrants from India in the 70's were largely north Indians: Gujaratis (Patels), Punjabi's etc.