Twenty-something,
Take it from a 30/almost 40-something: Winter tires are worth every penny.
Since I have been driving now for as long as you've been alive, I have had many near misses as well as a few accidents in the snow, back when I didn't understand, or couldn't afford, the need for snow tires. For the last 10 or so years though, I have never had any situations like I used to- all because now I always buy dedicated winter tires and wheels for all my cars. Even though the CX-9 set I will buy will be my 5th set of winter tires I have bought, have I wasted money? No, I probably saved myself 10 grand somewhere by not totaling one of my cars in the snow, or perhaps I saved myself from being stranded in a ditch or worse, putting myself or someone else in the hospital. Can you really put a price on that? From your state of mind, winter tires may be a waste of money. I guess I felt the same way when I was a 20-something. I could say trust me, you will change your mind in 10 years, but you aren't going to listen to me. Only time and experience will convince you that winter tires are worth it, even on SUVs with AWD.
That being said, I would like to address another point of your last post- You state the CX-9 is a POS in the snow with the factory tires. Now, I am the one touting how winter tires are so important, so this may sound strange, but I was pleasantly surprised last night when I drove our CX-9 through an intense snow storm driving from Canada to NY. I drove about 15 miles on scarcely-plowed secondary roads that had about 6 inches of snow with the occasional 8 inch+ drift. I never got stuck once even when driving up pretty steep hills while passing stuck cars. So these tires are way way better than say, the tires that came on my Audi TT Quattro. THOSE were useless.
That being said, I will still buy winter tires next season. I think what made the CX-9 so good last night was the AWD, stability, and ground clearance, and not so much the tires, but the car does go through snow as is from the dealer. My M3 is low, so it would have been useless last night even though I have winter tires for it. However, which car do you think will stop faster on ice, or go up a hill covered in packed ice better? Hands down my rear wheel drive M3 with winter tires would beat my factory AWD CX-9 on ice every time.