I've been combing the net for the past 3 days trying to find a solution to a unique problem my client is having. They want to build a wiki type website that houses the following features:

• Private section where users can purchase access to files/information
• Supports multiple users
• Public locked from editing wiki/article pages
• Is not self-hosted (Software as a service (SaaS))
• Is a managed service, updates/security/etc. are handled by service
• Does not have ads (can be overlooked if platform is really good)
• We own the content
• Easy to add content, with templates or something similar

There are several wiki services out there, Wikia.com and Wikispaces.com are pretty nice and easy to use. But there is no way to lock pages by a subscription or anything like that. Unless I'm missing something, I don't think this can be achieved via a SaaS.

So that brings me to alternatives. If I can convince them to use something like MediaWiki on a shared server, it would open up my options. I can't find any plugins for MediaWiki that allow for the PPV either though.

I'm beginning to think this whole idea of a "wiki" isn't really what they are looking for, since they mainly just want internal staff to edit the content. This led me into knowledgebase software, but I still cannot locate any type of "pay-per-view" type content locking that they need.

I can probably achieve something like this with a WordPress install and a mass of plugins, but that's very messy and requires someone on staff to make sure the site stays healthy and updated.

As you can probably tell, I'm very lost. Does anyone know of any type of service/software that would assist me in finding a solution to these issues?