Pure snobbism,I think. I haven't used Bullseye, but I am very fond of Unique. May have ta give Bullseye a try sometime. I hear a lot of folks complain how dirty Unique is, but I always repliy that after Black powder, it is as pure as the driven snow! :-D Seriously, though, I have noticed a lot of posts over at the SASS Wire concerning cleaning of guns and it is shocking how many never give a thought to maintaining their firearms. And they always wonder "why" when they have a malfunction, usually blaming it on the manufactuer. I wonder how many "bad" Winchesters and Italian clones can trace their problems to poor cleaning and maintainence? Many of these folks are afraid to try Unique.