Because I considered it a good starting point as I can place a redirect notice there if we move to another place, without worrying we will lose the DNS again. If you want to help, feel free to do so :-)
This cost me $17.32 for two years—so this time next year, even if there's not $11 or whatever available, there'll be a whole other year to come up with it.
NearlyFreeSpeech.NET (which this isn't using right now; it's just on a free static host) allows anyone to deposit funds into an account for sites hosted there, not just the person behind the site, which means it can in theory stay up indefinitely, even if the person in charge is incapacitated and/or stops putting their own money into it (so long as they don't actively take an interest against its continued operation).