It's like jeckill & hide...
On one hand people want to hear your mix in good quality and enjoy listening it, because you always bring the newest, freshest & trendiest tracks from the clubs to their homes.
And on the other hand there are people ripping tracks from your mixes just to get the unreleased tracks and use them in a wrong way.
But still, sometimes it's pretty annoying you playing some awesome tracks and not have the possibility to buy them for over a month, months or even never! I say: Re-mode - playing (ingrosso rmx). This is pretty frustrating!
What if you shorten your tracks to 3-4 minutes? Or is it impossible?
To me: I still put the mixes on my iPod regardless of the bitrate...but it would be nice having it on 48-64kbps, so people can hear what you're actually playing