Ah, now I see the problem. You don't understand the definition of quality. You think that the quality of a product is variable, determined after it has been made, by the number of units sold.
No, quality is the result of what goes into making the product. It cannot be changed by sales. For example, a gold ring set with a diamond is higher quality than a gold ring set with something that looks like a diamond. But the sales will be driven by what the customer thinks is value for money.
Some customers will go for the higher quality because they can afford it. Some customers will even take out a mortgage to pay for it because of how much it means to them. Some customers will go for the low quality one because they can't afford the high quality one. Some customers might choose to buy the low quality one because they don't think the high quality one is worth the price.
Often, the lower quality version will have the higher sales because it is cheaper. Customers' perception of value may vary, but sales cannot be used to measure, determine or change the quality of the diamond, or the quality of the diamond look-alike.
Likewise, sales cannot be used to measure, determine or change the quality of a single game or a single console, since its quality was determined at the point when it was made. Consumer perception can change. Consumer perception (and ultimately, sales) is influenced by advertising, hype, critical reviews, news articles etc.
A company can make the highest quality consoles and games in the world, but if they're not pitched and marketed properly, they won't sell.
That's why your statement is irrelevant.
(edited for clarity)
