They may need more than one, and I'm sure there are fixed or near-fixed labor costs pertaining to HR, legal, accounting, etc. but what business function besides

They may need more than one, and I'm sure there are fixed or near-fixed labor costs pertaining to HR, legal, accounting, etc. but what business function besides content curation - which another commenter above claims is entirely volunteer, does WMF need that approaches even a linear growth rate to remotely justify the jump in orders of magnitude, let alone 300X?