This is a great piece. I too started a company just 5 months ago. Fully bootstrapped and now con track to do 7 figures this year. Cash is king. You'll also be protected from the bubble when it goes BOOM :).
>1. You are forced to focus on revenue
This is really the biggest point. Plenty of "cool ideas" are implemented in favour of more needed products in the marketplace -- needed so much that people will pay for it.