I think that makes sense; but doing it on the client means that your computer has to do the work for you, thus distributing the load among all clients. Doing it on the server would mean that their machine has to do the work for all players.

If we complain about companies being too quick closing up their servers when games are not as successful as they hoped... imagine if those servers were x10 or more expensive, due to that kind of analysis for all players. Companies would be much quicker to pull the plug, I guess.