They sub for the attention. If you haven't noticed, they pick up on a lot of series, and then drop the half that don't get as much as attention as they'd like. Then they take their time knowing that other groups won't bother subbing said shows.
And then they release everything in XviD encodes and try to tease people with their UPSCALE encodes that are still in XviD except in a MKV or MP4 container. Shitsux.