Space is cheap. I don't even bother with flac anymore. Wav vs. Flac isn't really a 2:1 ratio (I think I save like 40% space BITD), so why bother. Sure if you have limited HDD space, but 2TB drives are approaching $100. That's like 2,000 CDs or something like that, uncompressed. Now for internet sharing and other things, it's significant since you're talking several hundred copies over an already slow connection. And other I have the highest quality version, and that's my proof that they stole my work. Otherwise why bother?