AWD is not necessary in a sports car IMO. Frankly, I think all these people that think they need AWD really don't. Amazing how long people have gotten by in this world driving cars that didn't have it and now all of a sudden it's a necessity? For what? It's as silly as those people that spend all that money on a 4X4 truck and yet the thing see's dirt or snow maybe twice a year at best. Waste of money.
I started driving when I was 7, in my dad's 46 Willys jeep and probably have a lot more 4wd experience on the ranch than most people who get SUVs. But I have generally agreed with what you are saying. Paying for the extra weight and front-end assembly to drive the freeways to work just seems silly.
I purposely didn't buy 4wd when I got my latest car (the Highlander), thinking along those lines. But since our family lives near the Eel and we like to car camp both in the Sierra and Coast Range, I have had to borrow the folks truck to get up the logging road and into the river basin on multiple occassions to go swimmin..Next car I get will have it.
We took the Subaru Outback wagon (Ms. BA's car) to Anza Borrego but I nearly got us stuck on a big piece of granite or something sticking up in the middle of a desert road, making me want the clearance I mentioned. Not terrible I just scraped, but its a sickening sound, full of implication. I will say that that damn little car went right up the sand "river" (or wash, I guess they call them) at Font's Point as though it was a dune buggy. I was driving and I was feeling crazy to have even tried it, but the AWD came thru there, as well. Otherwise, we just couldn't have seen it. I hate having to miss stuff that way.
I just have always noticed that in the rural roads that challenge my cars, there is always a spot where you're basically trying to drive on a road that is part ditch. So having AWD on a low-clearance car seems weird, except maybe for snow or something on a paved road.
Then there's driving through water. 99 times out of 100 you can probably make it thru a creek (like the one that crosses the road up by Fern Canyon at Prairie Creek) with 2wd, but I have to say that 4wd or AWD is a bit of insurance that a person would want.
These are the real-time scenarios that give one reason to want it. But for snow skiers that now have to chain-up anyway, your point remains well-taken.
Editing in: since she bought the Subaru, I don't call 'em "Liberus" or "Lesbarus" anymore, but I still think it).