'Ads following you around' is actually necessarily a form of inefficiency, just the opposite. There may be a very good reason for you to see that specific ad, instead of and ad for some random for a pickup truck.
Consumer wariness does not translate to lack of surplus on their side. Products that truly provide no value tend to not find the light of day for long. It's actually the very last phase of 'demo/trial' or even 'trial post purchase' where customers really find out if they're going to like it, and most cases, the surplus goes to the consumer.
We live in a very different world than 100 years ago.
The value people get out of stuff they buy is immense - we live in a 'total surplus economy'. We get clean, cold/hot, drinkable water, in any volume - literally coming out of the wall. This is basically a 'magical product' to anyone in history. How much would people may monthly for potable water if we really wanted to increase the price? A lot. Possibly 10x more than they are paying now. That means all of the surplus of water has been socialised. For many other products, it's the same thing, the question for consumers boils down to 'where do we want to spend it'?