I don't want to speak about the goods or bads of both kinds of Operating systems, I only want to share a little experience with you to comment it.
I live in Spain and I have home some old unix systems, some of them that I want to sell or change for other things, like a pair of Sun Blade 2000 and a pseries 44p 170 (IBM AIX RS/6000) and some others that I will be probably throwing away in short like a pair of IBM 43p and a Sun Ultra60.
In my research I haven't found any place to sell my computers (I don't like to use ebay, it looks like when you put 5000 papers diferent sizes on top of your table, open the window, let the wind make his job and use your lighter to give it some fire), and I think that there is people interested on these kind of machines also in my country...
My other experience is that I have posted in some linux forums telling that I want to donate for free my old 43p for example, but I wanted it to be usefull for some project (to help creating a port, help improving hardware drivers in some distros or making some kind of service to the comunity...) and no one has replied to me asking for it.
For my understanding there seems to be a great comunity that studies UNIX, or improves linux, but when you try to help the comunity with somethink like this... there is no clear way to do it.
Thanks for your reading, I hope to see some comment.
PD. Sorry for my bad english.