I think Apple products are more than just "tools" but also design pieces hence why I get mad so to speak when I see a scratch on one of them...if I ever plan to resell them they'll be more valuable if they've got no scratches or only very few.
They're tools first and design pieces second. If you just want to look at them, encase them in glass and look at them. If you need to use them, you're needlessly getting yourself worked up over something that has much less real value than you're imagining.
Let's say you want to sell your totally unblemished iMac in two years year and I want to sell mine that has a few dings in it, but is otherwise in perfect running order. You'll get more money for yours, but something like 10 to 15% more. People care most that it works fine. If you sell it four years from now, the expectation is fully that it'll have blemishes. You may get nothing more. Most people buying 4 year old iMacs don't care about dings and you won't get much reward for having a perfect one.
You might think I'm one of those guys who beats the crap out of his gear and everything looks trashed by the time I'm done, but you'd be wrong. I don't baby my gear and I've resold many of my old Macs at the high end of the cosmetic scale. There are some light scuffs and occasionally a small scratch... and it doesn't matter to the buyer.
To be honest, I do sometimes fret about keeping my gear in amazing condition, but I've learned that it's too much of a burden. Obsessing about keeping my gear in pristine condition prevents me from fully enjoying my gear or using it to its full potential. I didn't buy this stuff so I could fawn over it. It makes me happy to create and learn with my gear. It doesn't make me happy to have to be its caretaker.
On the other hand, if it makes you happy to baby your gear... well, do it. If it drives you crazy, let it go.
