See I would make this but looking at the IPB one...
According to it they have made $3,450. If I quoted someone to make a full system like this I would be quoting more than a CMS, probably above $15,000. This is a lot of work to do properly. A cheaper one could be done close to $5,000 but it is still well above what the IPB one has made and it is in a much larger market.
I work on the websites for games for this type of stuff so it is always on my radar and I do want to do it, would be cool to make. It just isn't cost effective in the current market. Hopefully now that the lawsuit has ended the market will start to grow again and bigger add-ons like this will become more realistic.