I also believe that .EDU accounts sit pretty well too, most likely because of the 'poor college kid' syndrome and the .ORG rationalization above. Sure you may get some spam, but nowhere near as the rest of us. Now, us .COM and .NET people are had. Spammers feed off e-mail addresses. Joke forwards, like chain letters, collect many e-mail addresses very quickly.
Spammers are energy creatures.
Don't feed them and they will die.