You can't predict if this [your company] is going to be a billion-dollar thing, or a million-dollar thing, or a 10 billion-dollar thing. No one really knows. You should just focus on building something you think is interesting and valuable for people that gives you the lifestyle you want, and then just be happy where you are ... Then, if it happens... great, but it's probably not going to change your life drastically if you're already pretty content with what you have.