It does not look great. C cups are pretty much ideal. DDs are alright. EEs are grotesque.Yes there is, it looks great and attracts men. Thats good reason. Sex change is not a cosmetical operation.
A good reason for getting a sex change is because you want to get a sex change.
Another good reason is because the junk sometimes gets in the way. It flops about uncomfortably when doing Butterfly-twists in the nude.
Another good reason is because you want to use the girl's restrooms, which on the whole tend to be much more sanitary and pleasant-smelling.
Another good reason is because you want to have female naughty bits to play with whenever you want, without the hassle of maintaining a relationship.
The list goes on...