It doesn't seem too important, but on boards where the Copper is almost as bad as the curse, is giving out curses other ways a bad idea? Like would you give a Copper for a Copper w/ Swindler? Certainly I can see a Ruined Village or something, but a Copper is still quite a bit better than a Curse. Of course it depends on what kind of trashing there is and how many turns are probably left, among other factors. But generally would you give a Copper or Curse? For simplicity just say that there is nothing that improves Copper significantly, no Fountain, Coppersmith, etc. Not even Counting House.
EDIT: by extension, could it make sense to change a Curse for a Copper? Assume no Museum or Fairground, that kind of stuff. It seems risky, but are the odds you'll get more Mountebanks through to them worth it ever?
