I guess if you're one guy on your own bootstrapping it, it's not terribly important, but if you have a team and you want to be able to pay them, pay for a space

I guess if you're one guy on your own bootstrapping it, it's not terribly important, but if you have a team and you want to be able to pay them, pay for a space to work in, pay for business trips to meet potential customers/related services, then you'll need funds. It gets more complicated if you need to get specialists -- people for web design, print design, SEO/analytics, PR...