Startup Idea : Sell Quick, Buy Right Classified Website

This would be a classified website where buyers are able to make an offer for posted items for sale, while sellers would be notified of these offers via email. And when a buyer makes an offer, this is achieved by debiting the offered amount on the buyer's cash account which would be hold by the payment processing compay and would be release to the seller once the buyer is satisfied with the item(We would need to partner a bank or any online payment company for this feature) This idea would allow sellers sell quickly by going for the best offer and serious buyers, while the buyers are happy buying the right item at a right price. This idea is set to solve the problem of time wasting when selling and buying at your desired budget.