Macbeth's acts were not worth doing in his case but if it was for his whole life it would be. I don't see anything with cheating to get to the top of you can't be harmed. If I could cheat in baseball and not get fined or frowned upon I would. Everyone would cheat if that's the case. There would be no reason to not cheat. It would become an arms race of cheating.
The bigger question is is making it to the top worth losing close ones. If I lost my girl, bestfriend, and role model I would be lonely and empty. I'm sure the rewards from cheating would sugar coat losing close ones for a short time but nothing would be able to pull me out of the life sucking abyss.
The worthiness of cheating to get to the top depends on your upbringing. Someone who is poor but is close to family, hard working, and ambitious wouldn't cheat. Someone poor that has no hope or anyone to rely on would do whatever it takes to climb the status later and make it to the top of the food chain. All in all I would rather have Banquo's blessing so my family would never be poor. In my eyes a rich person is more likely to commit macbethish acts because they are already hungry for power. They won't feel any remorse for cheating either.
If I was in Macbeth's place I would not commit the act he did because they were justifiable. He only had power for a short period of time and for that period of time people hated him.
