Skits enhance albums. They give albums life and personality. Of course, not every skit is going to work, but overall they're present for a reason. I don't know if they work better in the beginning or at the end. There are times I want to listen to a song with the lead-in skit, but it was placed at the end of the previous song, and there are times when the skit is placed at the beginning of the song, but actually close off the previous. And if they're separate, you still have to skip if you don't want to hear it (or compile a playlist without the skit).
It pretty much comes down to listener preference, but if they surveyed, it would prob be split.