Sales = Quality is just not true at all, objectively even it's just false
Sales are inflated by advertising, brand name and so many other factors
5 million people buy Game A, 100,000 buy its sequel
4 million people buy Game B, 3.5 million buy its sequel
If we take the simple the better selling game is better approach then Game A is the higher quality game but if we look at its sequel's sales that could show that a large number of the people who bought it weren't happy with it
Maybe in a world where everything was equal as in each game got equal marketing, no game had any form of brand name to back it up etc we could say sales = quality
In the real world quality is a part of sales, but it is not sales, higher quality = higher sales but not exactly in proportion to each other
