Here are three reasons why:
Having your personal website is the first and foremost way to show your serious in the internet
People are mostly visual creature. By featuring work samples, your website can act as a digital portfolio of your work and identity.
Hundreds of website name are made everyday. Secure your name to make sure you don't miss yours.
We hate spam email like you do. Don't worry, we are not going to send tons of email a week. You can rest assure. :D