source : http://www.flickr.com/photos/materialboy/
Probably this is one of the most exciting benefits in learning how to sell - it can grow your income.
As a young student at an expensive University in the Philippines, I had to be more creative in my studies wherein I had to earn money and study at the same time. Luckily, I was blessed by the Lord with a great talent of being friendly and being talkative.
During that time, I started to sell mangoes to earn money for my allowance. It was very difficult at the start, and since I did not have any sales mentor at the time, I made many mistakes. After a month, I started to become better at selling and have already started to learn a basic sales theory, "sales is not sales unless paid and collected".