Hi,
I can't give you any answer as to why CBS/Paramount have such high RRP (Recommended Retail Prices) prices, but all I can say, is that they are notorious for doing this, with many releases.
It's happened on releases of shows like CHARMED, THE TWILIGHT ZONE (old version), THE TWILIGHT ZONE (1980's version), and many, many others. For some reason, they are happy to:
1) Set the RRP's ridiculously high, at the start
2) Keep the RRP's higher than many other companies,
3) And then have the cheek to put on the back of many of these titles that "Some changes may have been made compared to the original broadcast versions" (or words to that effect), meaning you can't guarantee that what you are buying, is what you originally saw on TV.
Ultimately, they are free to charge what they want, but it won't help bring them sales from Joe and Jane Public!
Pooch