Sometimes, we just blow right by the beginners.
I too make sets on speculation, but it's hard to speculate were an animal might be, unless you have a familiarity with the animal.
"I dont bother w/ sign myself,"That statement can be severely misleading, I think reading sign is one of the fundamental tasks that a trapper should master. If you don't learn to read sign how will you ever determine what, if any critters abound you your traplines.
Once you find enough sign, in enough places, you'll be better able to quickly find and identify sign in future situations and locations. You will also become more adept at picking out those locations that are apt to produce, even though you don't find sign there, at the moment. But this comes with experience.
I think almost all experienced trappers make some sets on speculation, where no sign is present. But I think that a set which is made "on sign" has a higher probability of producing than does a set made on speculation. I believe a beginning trapper will face less disappointment if they endeavor to get their sets "on sign" whenever possible.
-- Hal