More likely than not, the only way shows like TPiR, Feud and the like would ever make it to DVD would be if there would be a compilation of several different game show in one box set.
There are companies out there that have put together video and/or DVD collections of shows from a certain era or genre that, by themselves, would not merit a profitable venture but by merging them with other similar shows, there is a possibility for a break-even or profit.
In many of these "collections', the shows that are used are not necessarily best-of's -- moreso random hand picked episodes.
So if you are going to write letters to Columbia House, Time-Life, or other companies who specialize in TV rerun collections, you may have a better chance asking them to assemble collections like the following:
• The Goodson-Todman, Barry-Enright, etc... Collection: Vol. 1: The 50s, Vol. 2: The 60s, Vol. 3: The 70s, and have one or two episodes from each series.
• Panel Games: (with 1 or 2 eps each of WML, TTTT, etc...)
• Q & A Games: (J!, $64,000 Question, Sale of the Century,...)
• Casino Game Shows: (Gambit, Card Sharks, Jokers Wild, High Rollers...)
Or my personal favorite:
• Game Shows -- 19xx (an assortment of 5 or 6 shows from each year per disc). What an interesting collection if you got a DVD with shows from 1975 like Big Showdown, Moneymaze, Gambit,...)