JOSE, I really think you ought to teach a seminar on auditioning. I have no doubt from your comments that many, many people are poorly prepared. Even the best college program only covers so much material; you have the experience to provide valuable insider insight.
Does anyone do this sort of thing? It's difficult to imagine that there's a single niche uncovered.
There are lots of US who do the audition workshop thing. And there are many people who participate in the workshops.
However, there are many people who go to these workshops, and don't really take away anything constructive from them. They go, just to go; to say that they've taken a workshop with Mr. or Mrs. So-and-So.
But there's the bigger "problem" of those people who don't think they need to go workshops, that they don't need to keep honing their skills and presentation. If they're not willing to help themselves, well, there's nothing that any of US can do about that.