If the company is in the business of making money - which as general rule of thumb they usually are - then yes, sales is what matter the most.
And things which have low quality don't continue to sell well. Games that consistently sell well tend to be highly polished, if none to inventive when they turn into franchises
And things which have low quality don't continue to sell well. Games that consistently sell well tend to be highly polished, if none to inventive when they turn into franchises