This movie, like most other Troma films, has one thing going for it: cult status. Cult films tend to have small but steady sales, unlike major movies that usually sell tons of copies upon their release but then quickly drop in popularity. Troma knew that there was money to be made with a DVD of this movie.
There are also lots of people that pride themselves in owning every Troma release, so many people would probably buy this DVD just to have the complete set.
So yes, this movie probably didn't do huge business at the box office, but Troma's rabid (literally) fanbase insured that a DVD would be successful.
That is an interesting point. I didn’t realize how many movies Troma Films produced.
Thanks for the insight.