What should I consider when buying or taking over a XenForo forum?

[XFdestek]

I'm considering the idea of buying or taking over an XenForo forum from someone else, but I'm not sure what I should be focusing on. Could anyone advise me on the important factors to look at? For instance, what aspects determine the forum's value, what adds to its worth, and what can help during price negotiations?

Any guidance or tips would be greatly appreciated