Do you measure the speed of your car in miles per hour or megamiles per kiloyear? Which one seems to make more sense (please, don't say 'its the latter' :-))?
Here is a fun bit from Bruce Schneier's latest Crypto-Gram newsletter from February 15, 2006: "Counterpane monitored someting like 100 billion network events, world-wide, in 2005. "
Think about it, "100 billions per year." How HUGE is that? Well, not huge at all. Its just a bit less than 3200 events per second.
Any commercial SIM product, such as netForensics, likely handles the volume like this for each of its large customers ...