What a great Topic. From what little i know, as the years passed, so did the music industry's merchandising skill and ability to extend the buying season. Sales of seasonal music LP's increased year on year in the early 1960's mainly because more people were actively buying albums in general but Christmas music in particular was being sold earlier and earlier. Also, Elvis' Christmas Album contained hymms that could have extended its availability beyond the traditional festive period.
In any case the deluxe original 1957 album and its various reprints was among the best-selling Christmas albums every year until the Camden album stole its thunder in 1970. With this in mind, it's interesting that the album is only 3x platinum. Can anyone confirm which of the two albums (1957 or 1970) achieved a soundscan total of 1,020,000 between 1991 and 2005?