Never knew anyone on this board that didn't try and help someone with a problem, and there are thousands here!
There is a competitive edge between professionals, and rightly so. Not everything is going to get shared. Leatherwork is not a dying art. It takes long naps, and wakes up strong.
Patternmaking/Custom design is too hard and tends to be a lot of original thinking, so no, a pattern, or trademark type super secret construction method, may not get spread around willingly. But there are standards that everyone recognizes, and are perfectly willing to tell you the ins and outs...carving, stamping, lining up basketweaves, how to do binding, etc.
In different fields, like bikes, saddles, or holsters, it's hard to get picked out of the crowd by a customer. You have to have something special to stand out....so, maybe that little something doesn't get shared. A person has to try and make a little money at things first, before they give it away.