I don't know about you, but I have better things to spend money on than storage that could otherwise be slightly further compressed. I'd rather wait a couple seconds longer and burn my money on upgrading the graphical fidelity of my machine.
Better yet, I could buy 3-10 games on Steam on sale for that money. Do you still think that's a worthwhile upgrade? Or would you rather wait another 3 extra seconds for every level reload in your game?
If you have more money than time, you could always disable compression. My problem is that I can't enable any sort of good compression and I'm broke.
3 seconds extra between levels, plus 20 seconds during the initial engine load, plus 5 seconds closing down the app, etc...Time adds up. If I've got half an hour available to play a game, I want to get in+out fast. My SSD can stream data faster than my CPU can decompress it. Why would I want to handicap the hardware that I paid good money for?
On the other hand, 15 years ago, I remember shifting data around to fit on my 20GB hard drive, doing the minimum install and running games from the CD to save disk space. My priorities would've been a lot different, then.
Flash storage is cheaper than it's ever been, and my time means more to me than it ever has. If I could spend a few dollars to have more gigabytes of fast storage, that sounds like a bargain.