Eh, maybe if the facilities are medically related (clinics, etc.). I just don't see the benefit of a school opening a dental program with money from their osteopathic program. Aside from $$$.
I go to COMP where we have a ton of programs - dentists, oph, pod, nursing, PAs, pharm, vets.. I'm sure I'm missing a couple programs, but whatever.
I think it's kind of cool. We're going to work with these people in the future anyway, so why not get to know them and figure out what exactly it is that they do? It's interesting to see why people got into the profession they did and what their perspectives are.
It's also good for public perception. Around the area, you'll see medical professionals of all types who come from "Western University of Health Sciences". It spreads the name, and to me, that's something that MD schools do much better than DO schools.
(Side note: Yeah, there's a Gentleman's Agreement or whatever to not advertise, but for example, you'll find ads all over the country for the University of Michigan Health System. Radio ads. TV ads. Even if a person knows NOTHING about an institution, a really slick ad might make them have thoughts like, "Oh yeah.. University of Michigan Hospital. I heard they were pretty good."
I'm using this ad as an example because I'm from the area and I think it's really well done.
http://www.youtube.com/watch?v=TxwcizqYFMI
Conversely, this ad makes me never want to call a lawyer, EVER.
http://www.youtube.com/watch?v=hQuLEoi_bQI )
Anyway, back to the main topic.
Having multiple programs also allows the school to change from being simply a stand-alone medical school to being a "University." I can't remember exactly what it did for my school, but being able to call the institution a University makes it eligible for some benefits.