theymos forgot to mention that most of the cost of the wiki (aside from the hosting and DDoS protection) is the upstream mediawiki developer we hired to make it suck a lot less.  He has a lot of work ahead of him including ...

• Keep the wiki updated, secure and with the latest features.
• Rewrite the cryptopayment plugin so it is suitable for open source, allowing anyone else to deploy it.
• Currently the non-English wikis are almost dead partly because of the terrible centralauth system, and the fact that each language is effectively another wiki, making it impossible to keep translations in line.  He will deploy the mediawiki Translate plugin, then convert all of the non-English wikis to use the same login system.
• Time consuming task of reaching out to the many non-English communities and teaching them how the wiki no longer sucks with the translate plugin.  They need to work on translating each page, one paragraph at a time.