Most internet businesses can be started from your own home, with nothing but a PC. There’s no need to carry inventory and with a good phone service, you can man the business yourself. 

Besides being less expensive, starting an internet business can be much faster. All it takes is obtaining a URL and working on some site development. Depending on how much time you can devote to this, you can be up and running in a matter of weeks, as opposed to a few months with a bricks and mortar store.

But perhaps the biggest advantage to an Internet based business (beyond the low cost of entry and speed of set up) is leverage. 

Leverage, in this case, means you reach not thousands but potentially millions of people. With a traditional business you end up being far more restricted by geography. It can take years to grow a traditional business big enough to be a national presence. But with an Internet based business you can reach millions literally overnight if you want