Anyone with a credit card and the internet can get simunitions if they spend enough time looking around for them on the second hand market. That's pretty nice if they'll sell direct to you or you have a hook up...
But there are obviously other concerns, such as the facility they'd be used in, since they can obviously do some serious property damage and are chalked full of liability. Then there is the issue of how many people will actually be open to the idea of getting shot by simunitions, as well as pricey safety gear and the guns themselves. Every part of this is a costly proposition.
If all of those issues can be addressed, by all means it sounds good, but I for one know I don't have 2 grand+ to dump on simunitions gear, nor do I have access to anywhere that would let us blast away with it. Failing that, I'd again say airsoft might be a good bet.