I actually don't think it is alright to use Authorship or Publisher on every page and this is not what Google intends, check out their blog on this:
http://googlewebmastercentral.blogspot.co.uk/2013/08/relauthor-frequently-asked-advanced.html
Specifically they say "Authorship annotation is useful to searchers because it signals that a page conveys a real person’s perspective or analysis on a topic. Since property listings and product pages are less perspective/analysis oriented, we discourage using authorship in these cases. However, an article about products that provides helpful commentary, such as, “Camera X vs. Camera Y: Faceoff in the Arizona Desert” could have authorship."
So while at this time using Authorship on non-article, product pages is 'unlikely' to get you Google slapped, you are going against their direct advice - which often then gets put into the algorithm when they notice something being abused.
You are right many sites are using this on every page, and it will as of now give you an advantage, even in not in higher rankings then in a more visible results listing which may have a improved CTR. However, as I said once Google see this is being abused they will attempt to stop the practice and make sure it is used for rich content pages only.
Publisher is different in that they want it to be from ideally the homepage to the Business G+ page, they are both different things and Google treats them as separate.
Hope this helps - basically, if what you are doing on your site doesn't benefit your site user, then you are right to question it.