You are absolutely correct. Time is money, and if time is being wasted in comparison to putting it on the desktop of users and running with it, suddenly the free option is not so free.
At my last job, we were presented with a high amount of frustration with the few people we demo'd Windows 7 with. That's when I made my argument, clean, clear, and simple. Whatever we move to, there will be change. Change is unavoidable at this point, whether it be 7, Ubuntu, whatever. Change is coming. So if change is coming... why can't we take this chance to switch?
Personally, with what our district has saved with going to Linux, there's no contest. I mean, yeah, there were bugs and a lot of research was done prior, and all of that requires time to set up and implement. But when it came down to the students grabbing these Lenovos and running with them... there really was no training. I mean, a lot of this happened before I started, but the way it was presented to me was they just took them and ran with them and used them just fine. The teachers had some crash courses so they knew what to expect, but it was no different than anything before.
That said, there's two sides of the argument when it comes down to things like that. If you're a graphic designer, every minute in the studio counts. Yeah, Gimp is going to cut you at your knees. In that scenario, probably a bad idea unless you want to spend a good chunk of your personal time at home learning Gimp so you can make the sting at work less noticeable. But that doesn't apply to all people. As I said several times before, Gimp and Libre Office as alternatives are not 100%. But they're close enough to at least consider.
I guess the bottom line is this. The situation at the district I work at will not apply to everybody. Will it apply to you? It sure may. It also might not. Time and time again I have heard the argument from Microsoft Inc. saying that Linux costs more money to use because of the training involved. Every scenario is going to be different. All I know is, this district did it and proved that is not always true. Tons of money was saved and a bright future is ahead.