I must admit, I've been intrigued with this concept of the 80/20 Principle for a long time.
If you haven't heard of it perhaps you should read up about this Pareto Principle in more detail. It could just be the answer to the question you never knew you have been asking.
“Conventional wisdom is not to put all of your eggs in one basket. 80/20 wisdom is to choose a basket carefully, load all your eggs into it, and then watch it like a hawk.”
- Richard Koch