Participating in Kaggle Competition
Kaggle allows competition in the form of solving and developing predictive/analytics models based on given use case scenario. The solution that could give higher accuracy in prediction results may win up to several hundred thousands of dollars.
Data Science job role is in hot demand now
In UK, a senior data scientist can fetch at least GBP100K per annum.
Writing books or giving training courses
A comprehensive data science course can charge student at least several thousand dollars for 3 to 5 days training.