You move in the city with thousands street cams, pay everyday with named credit card, post photos with geo in social networks and believe that VPN will save your anonymity. There is no more anonymity in the internet. Using VPN can just give you an access to the blocked sites and, possible, little increase the time that someone needs to find you. The main reason that we are not classified and marked till now - no one is interesting in our personal data.
You are right, more than ever our privacy is slowly being taken away and it does not seem as if things are going to improve, and if anything they are bound to get even worse.
However even if VPNs do not really offer too much protection against a determined attacker, at the same time it is still an additional layer of privacy and as such it is good idea to use it, because as you say since we are not important then no one is really making an attempt to find our data, so our privacy is in fact enhanced.