I see this as a bit of a Catch-22 problem.
I’m a home user, I don’t have lots of money to spend on IT subscriptions so the Crostino subscription is the one I’d choose.
But…the NethServer community is so good at answering questions the only real benefit I would get is stable updates. So, as I see it, the Crostino subscription is really for tested updates. However, thanks to virtualization and ZFS, I can snapshot my NethServer and install “untested updates”, then role back if things go bad. (Paying 48euro saves a lot of time and effort, but I’m an IT geek, so I can do all that stuff).
There is another CentOS based all-in-one server platform, which I’ve used for ages. They have a subscription service that adds an extra repository with additional software. However they’ve put their mail server into the subscription model and don’t (or didn’t) have a plan for what happens to your mail data when the subscription period is over.
Perhaps the way to encourage people to take out subscriptions is to offer additional features in the subscription service. E.g. improved content filtering (with a system that could be applied in schools), a multidrop POP3 connector (I’ve built one but it’s a bit of a lash-up ), Docker, commercial antivirus support.
I suppose the trick is to provide enough functionality to have a working product, and then offer upgrades to encourage people to part with their cash.
But please be aware that however it’s done, I suggest you have a clear statement about what happens when the subscription period is over - I’d hate for my server to get bricked after 12months!
FYI, I’ll be buying a Crostino subscription later on.