What factors do you examine when deciding whether to transform your side project into a startup?

Majority of makers/founders start small and eventually get BIG! Each founder's path to the startup industry is unique. Let the community hear some of those tales. (It doesn't matter if your product is VC backed or Bootstrapped) Don't know where to start? Tip: Who are you? What's your product? What factors did you measure to turn your side project to product? ...add anything you would like