Lol, yeah okay Ive been in many stan battles before, this was not meant to start one so get off my dick, the Katy **** wont work on me.
Grammys are amazing to win good to have, my other fav Carrie Underwood has also won plenty as well.
But overall success and sales are what pushes an artists career into longevity.
Sales are most important. It's all very good and well to have a critically acclaimed, Grammy award winning album, but if it's not selling then it won't make any notable impact, and hence is not likely to be remembered.
The Grammys are away to say that you are appreciated by your peers/folks in the industry. Artists strive to win them, and if labels didn't care about them, they would submit their artists for consideration.
Sales and charts are away to say that you are appreciated by the public/consumers. Labels want sales and chart success. That's why when an artist isn't hitting hard, they get dropped. If you are not bringing in the money, then there is no use for you on their label.