You are right about that, however the spammers would soon catch on and flood the network even more in all sizes

By itself it wouldn't work for long, but in conjunction with a IP filter or maybe even a hashfilter (AaronWalkhouse is trying to get the programmers to implement these options in the next major version) it would in my oppinion work great

http://www.gnutellaforums.com/showthread.php?t=53331