I'm delighted to hear that people are enjoying the game. I began gaming with Infocom's "Enchanter" along with other games of that period, and I've always loved the medium. Since the help file is fairy self-contained, I haven't heard from many people, so I'm always glad to hear opinions.
As Morandilas mentioned, it's possible to integrate graphics and sound into such games, but it's just not financially feasible yet. However, I only expect MTJ Publishing's customer base to grow over time, so it's only a matter of time before we can get started on bigger projects like a new game. I personally can't wait until we can.
And by the way, Jamandi, I believe the game you're thinking of is Lucasarts' "Maniac Mansion". That was really a classic; anyone who's never played it really has to give it a try.