I'm confused. From your original post: And to say that a person can only contribute to an open source project if they have equivalent freedom, time and indulgence from society as our very most privileged members, is to exclude a great number of people – I’d say 99% of people – who are capable and would be wonderful additions to our community.

This seems to postulate that OSS excludes 99% of people who are capable of contributing good code. However:

...freedom, time and indulgence...the freedom to pursue passion in life is often enabled by one's parents having enough money and stability. Time is mostly about leisure time. Having a job that supports work on open source is still not that common, so one is left with figuring out how to do this on your own time - and that depends on you actually having free time because you don't have kids, you only have one job, and you have the background knowledge (socially, tools-wise and background reading) necessary to participate.

Now you are discussing people who don't have the free time or knowledge to contribute good code. How would such people be a wonderful addition to a community devoted to writing good code?