I would agree with Ken that there is not a market for the early Sierra adventures. But, I must say the market doesn’t know what their missing.
The history of Sierra I would like to read about is Ken Williams, IBM and Windows (aka Bill Gates). The programs created by Sierra after the use of an IBM program mirror the behavior of Windows. There must be a story in that which would interest game programmers and early computer bufs. This was a transition time from MS DOS to Win 3.1.