The only real uses that I can see for it are in these circumstances
-A large nation buys one, and a small nation buys one, it is then used to help boost the small nation up further. Although this seems rather weak as the small nation is probably better off getting another wonder with it's own income
-A large nation is knocked down to near or at Zero Infrastructure and a large, intact nation can then funnel extra cash to boost the weakened nation back up
Either way I would get it when I run out of wonders to buy, but I doubt it will ever really be necessary