I have read the main advantage to home roasting is that it may give the freshest product. I suppose also it allows one to tailor the roasting to one's personal taste. Personally I prefer a light to medium roast, which can be hard to find in the days when heavy French roast is all the rage. I find most French roast coffees to be, well, over done. Kind of like drinking charred toast.
Still, I haven't gotten around to roasting my own. I'll seek out light to medium roasted Arabica and enjoy that instead.
Also, as I recall, Pete's Coffee, which got its start in North Berkeley, pioneered dark roasting of cheaper Robusta beans. It's quite an art, since Robusta supposedly doesn't take to dark roasting well. Nowadays I think Pete's sells mostly higher quality Arabica, but it's almost always on the darker side of the roasting scale.