80/20 Rule

Here is my list of questions to your question :)

• Is it really 20% left on the table? How do we know?
• Whatever the % that IS left on the table, what's it cost to get it????
• Whatever the cost is to achieve that last % number, what if we spent it on another part(s) to increase more power be worth more power than the money spent to get the last % of power left on the table?