Most of he subjects that make me buy came out long before I was born. That you should only be interested in the stuff of your childhood always struck me as a very limited way to view the world, and really, kind of sad.
As for the box art, I can honestly say that I don't care. What's in the box is what's important. If I can get a better kit of the same subject at a lower price, that's where I'm going to go.
In the past, I may have snarked that if you want art, buy a poster, but maybe that's not such a bad idea? Some of those old kits did have some very nice box art, and if collectibles are what you're after, maybe there's a market for some nice art prints of classic box art?