Oh I know there's opportunities, but when your employer hasn't sent you on training for 6 years and they are an investors in people employer it's hard to swallow when you go for jobs to get no return. Feedback comes back saying that you don't have the paperwork to back up the experience.
I can mess about in Hyper-V, Citrix, Exchange and anything else, but I don't have the paperwork to back it up because my current employer thinks everything is fine as long as they can get emails on their iphone or ipad in a meeting to show off.
We bit of a rant there, but that's essentially where I'm coming from on the issue. I identify training, oops can't afford it.
Maybe a very honest discussion with your boss is needed. Maybe he already recognises a need for the business but doesn't think he has anyone interested. Maybe you need to appraise him of that interest, and your current disquiet. I welcome that sort of thing from my staff - it shows they still care and are ambitious.