Let's face it -- the thing driving the sales of "prophecy" books is the vivid descriptions of exciting events to come, most of which involve horrendous suffering for a lot of people (present company not included, of course!)
How tedious, mundane, and routine must the post-mil vision appear by contrast. No apocalyptic thrill rides -- just a world filled with faithful people pursuing their vocations, raising their families, and inviting their neighbors one by one to join in the ongoing party. A growing percentage of the world's population receiving the gift of saving faith, and raising happier families. And, at the end of the best we can do, our own deaths.
Well, there is the excitement of seeing God take down His enemies by unexpected means. Happy Hal, recylcer of books and marriages (same plots, new faces), never predicted the fall of Soviet communism. Post-mil folks, OTOH, anticipate the discrediting of Islam, and ponder preparations for ministering to post-muslim millions.
I know a lot of dispensationalist believers who take quite seriously the Scriptures about avoiding rejoicing when one's enemy falls.
I can believe that folks on the other side are not so concerned about obeying said Scripture.