It's cliché, but totally on point:
Only sue if you have nothing to lose, or your opponents are ridiculously rich. (preferably: both).
Only sue if you have nothing to lose, or your opponents are ridiculously rich. (preferably: both).
Not quite your point, I know, but it seems to apply here.
Edit: changed my wording to be more accurate.
I'm not in any way experienced in law, but it seems like that would help reduce the number of fishing expeditions and barratry.