Ray-
The people with a direct interest in developing an endangered language Wikipedia may not be in a position to pay you for your "affordable" wiki hosting service. A supportive on-line community is sometimes a requirement to keep something going.
If Wikimedia wants to provide charitable wiki hosting for worthwhile projects then we should explicitly make this part of our mission statement. Furthermore, if we want to do so, the respective wikis should be independent of the main Wikipedia project, or any Wikipedia project, and hosted on wikimedia.org instead, e.g.
tokipona.wikimedia.org klingon.wikimedia.org elvish.wikimedia.org
This prevents the "bleed-over" effect into other wiki projects, where we will inevitably get a Toki Pona Wikibooks, a Toki Pona Wikiquote etc., all of which would effectively be original research wikis.
Furthermore, any such charitably hosted wiki should be approved by the community at large.
Regards,
Erik