Are all battles in one long sequence, meaning they are constantly on Doomsday's nuts, never letting him rest? If that's the case then he'll stop somewhere around Thing or Grundy. He'll take down all previous foes pretty easily but they'll still inflict him with enough damage to not be able to stand up by the latter rounds.
For that much money? Of course. If you're worrying about morals or making it right just use that money to donate like a million or two to the UNIA-ACL &/or some other like-minded association. Not like it's going to make a difference for you personally, but it would do a whole lot more good for the Black community in general than you not saying it (if you use the money to "make it right", that is).
I don't particularly like Keaton's portrayal but I always thought Bale was a horrible Batman & an even worse Bruce Wayne (though the Nolan films absolutely trump Burton's), so I'm going with Keaton. Both were horrible though.
Darkseid & Thanos won't even need each other in this fight - they would solo everyone by themselves in a matter of seconds, regardless of prep. You could bring on every damn hero ever featured in Justice League & the Avengers - Darkseid & Thanos would still entirely annihilate them with no difficulty whatsoever, it'd be like sneezing to them.
That's ridiculous, there are thousands if not hundreds of thousands of battles Batman would loose without even giving his opponent a fight. Realizing that doesn't make you less of a Batman fan, you're talking about fanboys, which is always a bad thing no matter how you twist & turn it.