Privacy vs. User Experience
dcurt.is
dcurt.is
Also, just because Google does have great products that benefit the consumer for this data collection doesn't mean that selling the user's profiles is worth it. (I personally think it is). I think it should be left to the user to decide, which is why Google has various opt-outs, data deletion, history removal, etc.
Yes. I'd quote Benjamin Franklin, but probably everybody knows the quote I'm referring to.