Well, also on the long run I think that would work well, there might be some caveats.
Someone could decide, that instead for spending time trying to write one good quality post with 75% for author, instead one might just create 20 accounts and provide 100 crap posts every day with 10/90 author/curators ratio.
There might be another option as well, "your reputation = your author reward percentage "
So, 25% for a newbie, you and me should be happy with 55%, 66% for @timcliff and so on.