That makes sense. You should also consider a system such as eBay's where each seller can have their own feedback page for people to either vouch positively or negatively and aid other users in deciding whether to purchase from said seller or not.
The website already has product review system, after you purchase the product buyer gives rating to the product/seller and seller rates the customer as well. So we have both vendor ratings and buyer ratings (and vendors can specify if they want to sell product only to buyers with good rating)
Outside bitcoin and litecoin, when are you people going to add others coins like ripple, wave and ethereum. Some of us hold others coins and before one will convert them for the purposes of buying digital good and services the cost will be too high.
We also support DASH (0.03$ tx fee compared to ~$0.15 for LTC and $1.00-3.50 for BTC) and will add Ethereum & Ethereum based tokens quite soon as well
We are in process of adding automatic withdrawals for multiple currencies too, so when someone buys your product for BTC/LTC/DASH it will be converted & withdrawn to your wallet in any currency shapeshift.io supports (as soon as buyer releases money)