And you don't? There are things that are sent via email that doesn't get sent when you visit sites. Personal things are sent via email; corporate things are sent via email; banking statements; billing information, etc. These things aren't tracked via Analytics. Even then, block it is easy, so why not do it?
First, my personal things sent to my e-mail aren't important enough to matter. Next :
- Corporate things are not sent to anything other than my corporate e-mail. They are also encrypted.
- Banking statements are not sent via e-mail, they are available directly from my bank on their banking site. Encrypted.
- Billing information information is not sent over e-mail. Credit card information and confirmation numbers are viewed on e-commerce sites. Encrypted.
Google via analytics though tracks where I shop, what I read, what my interests are, etc.. etc.. through my browsing habits. I don't care enough to block them. I use an ad blocker for the annoyance factor only.
As far as "Google selling my info!" I'm not daft enough to even consider that remotely true : Google doesn't sell my info. They sell ad placement based on my info. The 3rd parties don't get my profile, they give Google a profile to target and Google does the leg work.
Google makes their money off advertising and the information they collect. It is precious to them, they wouldn't sell their biggest money maker.