Something to consider is that as you all know, the World's Fair comes pretty early, which can unfortunately be a bad thing.
Winning the World's Fair doubles culture per turn, but even with that, in my current game, by the Atomic Era my cpt exceeded the cpt I was making after winning the World's Fair by far. Definitely bulb Great Writers by that time.
Do any of you deliberately try to delay the World's Fair? I delayed it to the second World Congress session, but delaying it any further than that might have caused it to get in the way of other things I wanted proposed, like World Religion and World Ideology.