I  have always felt that having your brand name in every title tag though-out your website when your URL is your brand name is a waste. The space your brand name takes up could be used for more valuable non-branded keywords. If your brand name is unique, the URL (and content optimized with your brand name) should be enough to have you rank #1 across the board in search results. Though I beleive this I still think it is valuable placing your brand name in the back of your homepage title tag.

Example: Full Service Advertising Agency | Your Brand Name

Any thoughts why you should or shouldn't do this?

Isn't this useful for branded purposes? Doe this help click-though rate? Don't you want your visitors to know our brand at first glance of search results?

Another argument I had for doing it was if it weren't important, than why does every search site do this?

http://moz.com/

http://searchengineland.com/

http://searchenginewatch.com/

http://www.seroundtable.com/

Thanks for the help!