Not sure how anyone else cuts firewood but I don't "lug" my saw around all day. I lift it a little here and there but most of the time the saw is floating through the cut like butter or sitting on the ground while I mark cuts or load rounds. I have no interest in lugging ANY saw around all day no matter what the weight is and I think I'm in good company.
Also, let's be honest here. I'm guessing most of the members on this forum are not going to lug their saw around all day because they are not making a living with it, including myself. Heck, I find myself dickin around with my saws, practicing cuts, playing with the tune, experimenting with tooth angles, etc. because I enjoy it and don't have enough real cutting to do. So to say it will make a HUGE difference (for the vast majority of us) makes me, well....chuckle.
PS: You can tell a lot about a man buy the truck (or trucks) he drives. I'm pretty sure the OP will not notice that extra pound based on this single fact alone
.