Yes, but you very soon reach the point of diminishing returns when you try to research any purchase. After a maximum a few hours it is hard to find any more use

Yes, but you very soon reach the point of diminishing returns when you try to research any purchase. After a maximum a few hours it is hard to find any more useful information about most consumer goods. You have read all the specifications, and the tests and the reviews and went to the stores to look at the products in person. So even if you might spend half a day researching an expensive TV, you won't make a better buy of a car even if you spend more than a day or two researching. And if you spend ten full days to buy a car, you are most certainly wasting your time (and will lose more income than you can optimise your car purchase).