I think the problem with the number of morphues users is the fact that it USED to be an awesome network, and the users are loyal to that. Unfortunately it is now a second rate program that as Taliban mentioned is flawed. Hopefully one of two things will happen:

the promised 2.0 vesion of morpheus will be debugged to sufficiently merge into the gnutella network

or, the users will figure out that Limewire is much better, as I did