Be careful with this. It's of no danger to most websites and webmasters but when you announce to Google that "I DEFINITIVELY OWN THIS SITE" you're signing up for the unknown. Google may or may not place guides and restrictions based on you and/or your history of which the contents of are unknown to you. It's a game of roulette though most likely safe for the majority of webmasters.
If however you've been penalized on another site and/or are working on some rankings issues of some kind you may be 'infecting' your new site right out of the gate. Make sure your portfolio is in clear sailing mode before you use this for a new site, imo.