Some of us do not want any one company or organization to know that much about us, especially an advertising company. The aggregate of all the the data they collect from the vast number of services they operate is staggering. The seemingly innocent individual connections mask the big picture.
If you use Chrome, search, YouTube, Google+, Maps, Gmail and Android, think for a moment just how much data passes through Google and google controlled properties and how much someone would know about you if they had access to all of that data.
What does Google do as a company? Apple is a technology company, they make money selling hardware and software. Microsoft, same thing. How does Google make money? Selling technology? Nope. They OWN technology but they don't make any money from it directly. They allow people to use it for free, all of it. So how do they make money if not from selling technology or the use of technology?
Google is an advertising company. That is how they make money, that is what they do. You thought they were a technology company? Think again! Technology for Goggle serves three purposes:
1) it is a means of delivering ads which Google gets paid to deliver,
2) it is a means of collecting data for accurately targeting those ads,
3) it is a means of measuring the effectiveness of the ads in modifying your behaviour.
The better targeted an ad, the more you can charge for it. The data Google collects from and about you allows them to charge top dollar for the ads they are sending you. Those ads don't have to be on Google properties, they can be on sites like EEVBlog.com as well. Being able to demonstrate the effectiveness of those ads in modifying you behaviour further justifies the premium rate charged, and so it should, it's good value...for the advertiser.
You are not getting Google services for free. Advertisers pay for those services and in return they get to target you with their advertising. Google uses the information they collect about you to charge premium prices to those advertisers in a way most advantageous to them as a corporation. If that doesn't bother you then fine, but don't expect everyone else to give as few fucs as you do about being more effectively manipulated. The next time you walk into Wal*Mart to buy some rubbers and your Galaxy 4 pops up a message reminding you to buy lube as well, think of me, but thank Google.