stock vault is yet another site that proftis from your images and returns, at best, pennies in adsense revenue. you might make a bit, but if you're serious about earning money from your photography, check microstock agencies and hosting your own site
I've written a number of hubs about this including http://cascoly.hubpages.com/hub/Can-you-make-money...
these give detailed advice on various ways to earn money from your photography.
another approach that i'll be reviewing soon is a new open source project that creates a sales site for you
one of the major benefits of symbiostock is that it includes a network of other independent photographers, so if someone doesn't find what they're looking for on your site, they'll be directed to other sites with similar offerings