Part of WB study to see just how stupid people really are. For Series 7 they decided we wouldn`t want 8 episodes per disc, rather 4 with pointless `director`s cuts` on the b-side, showing all the s***e that wasn`t good enough to be in the episode in the first place. At the same price! The result, 6 discs instead of 3 for the series.
Unfortunately, judging by the top 10 charts on Play247, it looks like plenty of people HAVE been stupid and bought them, so a precedent has probably been set for the future. Grrr.