I'm sympathetic to the act that TZT's history, whether the value is inflated to you or not, is part of what motivates you to maintain the board. You have shouldered the cost and workload of TZT, and the idea of permanence - having something tangible to show for all your work - isn't going to matter to us in the way that it is to you.
But I think that the meaning you get from it is somewhat illusory and detached from the utility value the history provides. The community sustaining and social value of this board depends basically zero percent on maintaining a history beyond a few months (i.e. it is NOT "Just a chatroom") and the nostalgia/memory value of our history is mitigated by the fact pretty much everyone seems to acknowledge they almost never check it.
So is maintaining this illusion of value A) necessary for you to continue to maintain the board (and if so, why?), and B) is it worth causing distress to board members? Or even being potentially harmful (although I doubt anyone is going to have their positing history mined, it is possible, I guess).
My positing history is pretty benign, so I don't have much to worry about even if someone DID want to mine my history here. But I am sympathetic to people who are worried about content they produced when they were insecure, stupid kids coming back to bite them now that they live in the real world.
On a personal note, although I don't think this should really factor into any decisions being made, Searyx is the biggest reason I post here. Combine him with you (Utumno) and Agrul, and that trio makes up literally 100% of the reason I started posting here again. My other friends barely post here anymore. So, on a personal level, I hope you can figure out a way to accommodate Searyx.