I make enough money from my main job. Bills get paid, investments get funded, life is good. A while ago I built a small SaaS tool to solve a problem I kept running into at work. I wasn't trying to start a business. I just wanted something that worked better than my spreadsheet. Eventually I put it online and started charging for it. The funny thing is that the money barely matters. When someone signs up for $4.99, I get way more excited than when my paycheck hits my bank account. Every...