Fair question, and I would suggest this:

I think a good enough reason is because some one could. No reason why some one cant just say; I can do that too, and I know lots of people say they would like an alternative, so lets just give it a go and see if any one likes it enough to use. And for me, that's good enough.

Giving it a go for no obvious reason is the blood of a "hacker", IMHO. Its the doing of it that is of value. One learns form the experience.