The question of if one should go for Energy or Entrepreneurship is interesting.
Entrepreneurship lets you work on your own companies while Energy lets you work on other people companies.
For a person have Energy 8, PP 28 working at 0.126 after tax will earn 0.8x24x28x0.126=67.74 coins per day.
While if he has used the skills for Entrenpre., instead of Energy, for a company having 60% bonuses with 0% fideilty, his earnings will be:0.5x24x28x1.60=537.6 pp per day. Which when converted to currency, for example after producing steel, will be 537.6*0.08=43.008 btc per day.
Quite a difference!