the real, real real reason we put effects on equipment? And, the reason we chose the pieces we did?
to have players re-explore areas that were being neglected, at the time, there were many nicely written areas, but nobody visited them, so we gave people a reason to explore areas again.
there is pretty much 1 effect in every area
some are hidden, some are hard to come by, some can only be found by reading the area room descriptions, and reading the areas theme.
some require just dumb luck