As long as the file size is less than 4KB, it will take up 4KB on the hard drive since that is the (default at least) cluster size for NTFS in Windows. So to take up 666MB of disk space you'd need 166500 setups.
One does not need to do all of that to be a successful musician. Also, musicians make very little money off music sales these days anyhow.
Internet piracy doesn't affect ticket sales because in my living room I don't have comfy seats with cup holders for a big group of friends, some awesome 10+ speaker sound system, somewhere where I could buy refreshments if I so desire (though usually I'm too cheap to do so and it's usually overpriced), and a 70ft wide screen. Most of the money made from movies is from box-office sales.
Look at the movie Avatar. I didn't like it very much, but that's beside the point. 760 million in domestic box office sales, 190 million in domestic DVD sales. The production budget was 237 million....
Those aren't very good graphics. Equivalent to GTA:SA with slightly better textures (may appear this way due to the small screen size however), better looking sky, and nice reflections.
WAV is just a container format. You can store compressed data in a WAV file. You can even store mp3 data in a WAV file. Whether or not LFS can read a compressed WAV file, and if so which kinds of compression, I have no idea.
I just got bored and tested it very quickly. I tried two kinds of compression, 4-bit ADPCM and 2-bit cADPCM. Neither would work with LFS, it turns out it requires a 16-bit, PCM wav file. Bit rate doesn't seem to matter, though.
But the dampers in LFS aren't adjustable enough. The most adjustment you can get is 2-way, on the GTRs, single seaters, etc. But some racing dampers have 4 way adjustment (high/low speed compression and high/low speed rebound). If anything there should be more suspension settings for some cars. I also think adjustable spring seats and bump stops where applicable would be a good addition. Because right now the ride height adjustment in LFS seems to only adjusts the overall height of the spring.