I never expected tech trade to be so fast in MP.and it seems tech trading is going on at a large scale.
Their does seem to be some; "if we don't , we get left behind, let's trade" syndrome thing happening.
Could be the fact that it is PBEM and we are not very good at coping with the time scale of it all?!
I know that in SP I often find myself going faster trough the city build cycle when the AI has declared war on its turn. There is absolutely no reason to do so, but still...