Actually, it's harsh to just blame Disney... ALL major studios HATE the idea of DVD box sets that aren't sitcoms that you can watch on television or online legally for free. I mean, current shows are like 40-60 bucks each, and for the most part, cartoons can range from 15 bucks to maybe 40 at most per season. You can get the complete Bravestarr over here for like 20... and that's 60 something episodes. That is, if you don't mind the quality or the fact they're in little envelopes. WB failed to give us the rest of Animaniacs and Tiny Toons on DVD, and most of their new shows get the 4 episodes for 15 bucks treatment (as it's perpetually 1999)...it tells me my loathing of disney is justified.
Disney knows how to put one thing and one thing only on DVD... movies. They're masters at it. They're masters of hiding a movie in an imaginary vault for 10 years only to rerelease it with a new Disney tween pop star of the year rerecording one song from the movie. They force every TV show they have into 90 minute movie formats too.
Still, I don't see ANY harm in releasing P&F in a freaking box set, even 13 episodes at a time. That's not preventing internet piracy at all.