Let's put it this way. Abstract this idea to society as a whole. How do you make everything free for everyone?
If you can figure that out, you've figured out how to create value in the idea for businesses. And, if you can do that, you should be able to come up with an interesting (if not compelling) case for at least looking at free betas.
It might be a challenge, but you're asking for something big here. The least you can do is put some thought into it beyond the standard party lines.
I love the monk analogy, btw. I don't believe it applies (as I know far too many OSS people who are in it for the hate, not the love, or are even in it for the fame). But, it's a very good point. The problem is that I believe all software developers are those
monks. If those monks had gotten paid, it wouldn't have decreased the value of their contribution.