It's pretty common (in my experience anyway) for MTBs to quote the frame weight sans fork, since anybody who is doing their own build is probably going to select a fork separately. Regardless, the difference between a heavy touring frame and the lightest stupid-light race frame you can buy is around two pounds, not ten. Significant for an XC race bike, but pretty much totally irrelevant for a touring bike. I mean, a pint of water weighs a pound. You can take a pound off your rig by having a good crap in the morning.