I would love to. GameRebels was a deep passion of mine.
Unfortunately, the amount of resources it would take to get the site up to XenForo 2 would be a lot. It currently still is on XenForo 1.5 as there is a tremendous amount of custom work and addons. Not to mention some of the addons it needs to function were not ported over to XenForo 2.
This alone was a big part of the site. We allowed users to earn credits that could be used to purchase real legal games. There was a lot of custom development that went into creating that addon, some by a third-party developer, and a lot by me. That alone would require a lot of time I currently don't have or a significant amount of money.
Perhaps one day I can get the time to upgrade the site.