Not as easy as you would think: gotta download the original FLAC, then download a program to convert it to MP3, then actually convert it...never to listen to the FLAC file again. Not to mention that you have to spend an hour or so downloading something (bringing the rest of your PC to a standstill) which you then have to spend ages converting again anyway.
Just a lot of time taken up which could be really cut down on.
Wouldn't it be easier for one person to convert it then be able to share?