OK, just to be clear on this:

LimeWire only connects to Shareaza Leafs and refuses connections with Ultrapeers?

That explains a lot. I occasionally run Shareaza on my PC and I upload mostly to G1 clients. Mostly BearShare, Gnucelus and GTK, almost no LimeWire at all.

I don't think LimeWire is doing its users a favor by blocking Shareaza Ultrapeers.

Tell me this is not true.