One issue we have experienced though is that once our films hit Amazon and iTunes and Netflix, our personal sales dwindle to a trickle. Don't get me wrong, we love to see our films on these sites as it provides the film with greater exposure and sales. But it hurts to see the sales from our Web site flatline.
In the end, this is a good problem to have as it means your film is available to the world and gaining an audience. And you can do marketing campaigns to drive buyers to your Web site so all is not lost!