I think that if anyone is using Emu oil in the hopes of growing hair, they're using it for the wrong reason. I use emu oil, but only after other topicals. From reading on it, it has very small molecules that are absorbed very easily. So it should sort of act like a battering ram to drive any other topicals into your skin.
Plus, it is great for your skin & is a pretty potent healing agent too. Many, many documented cases where emu oil treated wounds heal days quicker than without.
I may be biased since I have very short hair, so it's very hard for my hair to look greasy. In fact, I use emu oil in the AM before I go to work...I find that it helps to get rid of the minoxidil itch.