Aww, come now, you can get stacks with screens on them! Keeps out most bugs then!
Stacks look cool as hell though. And with the 78 carbs, they will work without all the troubles of the cv carbs.
You won't really gain any real performance over the stock box on a stock engine, but it will look cool.
If you stay off really dusty roads, engine life won't be that drastically shortened. I mean you might not make 100,000 miles before a rebuilt, but probably 70,000. All depends on your roads.
The ride IS the adventure. The destination is just to get gas!