This is definitely worth something, a lot for someone, not much for others. This will not be the top of the line item because it lacks, as mentioned before, some important stats such as discipline, however, it should definitely yield you nice amount of $ due to high IAS which is now the only way to get it up at the original item budget costs.
I dont dare to put a price tag on it but you can always try to put big range between starting bid and buy out or simply put it on Ah without buy out at all, with higher starting price.
You can also check other forums for price checks on similar items.
To someone sensible buying it - its probably worth 2M. If it had crit chance and + disc and elementar arrow mod that thing would be worth A LOT.But you can get still get a decent amount if you get lucky just because it has the legendary tag on it - specially on the RMAH since most people buying there dont have the time/patience to research the proper price and will pay anything cause of the legendary tag on it.
As others have mentioned, lack of Disc and a +dmg to something worth while (hungering or elemental). Dex and high IAS is nice but doesn't make up for the mentioned shortcomings. 1-2m to start, feel lucky if you can sell it for any more. Then again, there's a lot of misinformed DHs out there so....gl on your sale.