Sure, but I think this is what's happening now. Not because they are selling the company, but apparently one issue is that nobody in the community knows where the donations are going.
They (CoMaps) complain about transparency regarding finances. I believe this would be a good reason to fork.
Non-profit does not guarantee transparency, look at Mozilla as an example.
This fork is just a bunch of anonymous dudes on internet, who setup PayPal and replaced donate button. Until they do map data hosting, there is not much credibility!
Edit: there are 3th party mirrors for manual download, so I guess they can use those.
What I am saying is that CoMaps seem to believe that Organic-Maps-the-Company is not transparent about what they do with the donations. They have a bunch of other reasons, but this is the one that I can understand.
I can understand that they don't want to donate money to Organic-Maps-the-Company if it then uses it to write proprietary code and later sell it. Not that they necessarily do that, but that's apparently a criticism from the CoMaps dudes.