I couldn't agree more, when you buy a software, you are paying dearly for its license, and just a few cents for the actual media it comes in. Why can't I just backup this thing in any means I see fit, and get rid of the annoyance of searching a damageable media shoved deep in some drawer? Alcohol 120%, as mentioned, does a great job, creating a lovely image of this thing inside my HDD. Sure, I won't be juggling hard drives around like DVDs, so it improves reliability A LOT.
But back to the main point. Should they cover it in their warranty, proven that THEIR DVD-style CASE damaged the media, REGARDLESS of "how a user press a plastic button"? Sure. If the media proves faulty, as soon as you open the box (when you buy it), the warranty works great. It is harder to prove that case after a few weeks, and that's the catch when they will rip your guts (er, cash) off. At least they should give you a fresh copy of the thing, only for production cost. If they don't, you are totally entitled to resort to P2P-sourced bootleg copies, since you already own the thing, just as it was already said here.
Steam got rid of the damageable media before anyone else, you gotta give them that. It just takes you a few days (weeks) downloading everything, should you ever need reinstalling the whole shebang, and that's the only caveat. Of course, you still need backups, for a quick re-setup.
Anyway, an A4 paper, folded twice, stapled in an envelope-shape, works better than any case. Plus, any moisture will likely be absorbed by the paper. Those soft cases designed for car transportation are better than anything mentioned, since they are rugged, designed with soft material to prevent scratching on the inside, and have a hard external shell built for survival in glove compartments and sun-beaten dashes. I've had such a case in my car for 5 years, and none of my cheap-*ss CD-Rs ever malfunctioned on a no-brand CD player. If they work on a car, why won't they work indoors? My Playstation CDs confirm that, and so my DOS games of old. Even those jewel cases work GREAT, they will BE DESTROYED so your CDs won't. I have done everything to a jewel case, besides stepping on it, and its contents were alive and kicking.
Not using those DVD cases is the actual smart move, from the start, as I suspected.