I think it's a scale issue. A small group or individual can build up a trusted source of reviews, but the brand is worth a lot compared to people who are selling things, compared to the direct revenue from people who are buying.
So the incentive to sell is way more than people will pay for the reviews.
Combine that with a timing problem, a review at one year is pointless to new car buyers, since the new model is a bit different.
So the incentive to sell is way more than people will pay for the reviews.
Combine that with a timing problem, a review at one year is pointless to new car buyers, since the new model is a bit different.