Of course following the money for both is kidna similar in some respects. Both funnel insaine amounts of cash into "secret" projects (be they death rays (lex) or batarangs (wayne)). Both maintain an alternate external image to throw people off, lex as the hardcore busnessman, wayne as the skirt chasing philanthropist. Both own kryptonite, and honastly its for the exact same reason: If Kent gets too uppity, someone has to be ready for it. I figure if Thomas Wayne hadn't gotten gunned down, Wayne enterprises and lex corp would probly have a great deal of joint ventures resulting in who knows what.
Moral of the story: Often the people we disagree with the most are the ones who we see ourselves in. Put aside the differences, and try to work together.
Note: granted lex might need to tone down the employee to gunshot ratio to mantain good relatioins with wayne and wayne might not to stop (at least apearing like) being a whore, but isnt that what crossing lines and working together is about?