Following one's passion will ensure one put in your best into your business or career one finds himself, which will lead to positive results in whatsoever you put your mind in. The first thing that might be stopping one is the financial factor, from the example those people worked at a point and come have accumulated wealth to open up their new business. Also, environmental factors and economic situation because your passion might be watered down in your present country and you will need to relocate to a place where it is more valued.