I remember the first time I got a billing rate of over $100/hour. I literally stopped fixing food in my kitchen and started buying carry out food so that I could bill more hours. If I save $8/hour cooking but lose $100/hour because I'm in my kitchen instead of my office, then I'm effectively LOSING $92/hour. Can't have that.
So I started changing other things. Dry cleaning instead of laundry. Got a maid instead of cleaning my own office. Even cut my hair short to save 3 minutes in the shower.
Starting to see how easy it is to get carried away with the "opportunity cost" argument?
What's the worst thing you could possibility do? Anything that takes time without earning. Which is EXACTLY what happens in an early stage startup. That's why I simply can't let myself revert to that kind of thinking.
If accountants ran the world, we'd still be riding horses to work.