On October 30, the Wikimedia Foundation posted its audited financial statements for the year ended June 30, 2015.
https://upload.wikimedia.org/wikipedia/foundation/0/0b/Audit_Report_-_FY_14-...
The figures contained in these statements have a bearing on the present discussion. Some highlights:
Net assets at end of year: $77.8 million (up $24.3 million from $53.5 million)
Current assets include: $35.2 million in cash and cash equivalents $29.0 million in short-term investments.
Total support and revenue: $75.8 million (up $23.3 million from $52.5 million)
Total expenses: $52.6 million (up $6.7 million from $45.9 million)
Internet hosting costs: just under $2 million (down $0.5 million from $2.5 million)