I'm genuinely curious what makes you (and others) start new projects when I would think you have (or should have) your hands full with seeing how far one can go? In other words why and how do you feel your time is better spent starting a new project as opposed to improving/optimizing your current one? Is it a matter of burnout and just needing something different to think about? I guess I've always thought that running a business entailed hundreds of hats as it is, and optimizing different areas of your business would always leave you with something different to do.
Genuinely interested on your motivations if you don't mind.