There are many reasons why you could want to put a link to other websites on your own. For instance, your friend is a photographer and he took all of your headshots.
This one is a no-brainer. If you are an actor, entertainer or if you are in any type of show-biz, you will most likely have some sort of events that you would want to advertise.
I always tend to compare things to other things, so let me begin with that. If having an online profile is like riding the train then owning a website is like owning a car.
Having a domain name adds a personal touch. We'd be happy to have Bradley Cooper under bradley215.iadb.com and Cate Blanchett under cate_aus.iadb.com because they would be advertising IADB with their websites, but it is better to have your own domain name that are easier to remember and say something about you.
The main reason for signing up with IADB.com for a professional website is the fact that you will then have a website all about you.
This spring the Internet Actor's Database launches IADB.com, a cheap and easy way for actors to make the most of their digital world.