How much is a photo of journey signed by the entire band worth?
A photo of journey signed by the entire band could be worth between $30 and $100. You can check some of the similar photos as per your description that are being sold in some of the online stores like amazon.com and ebay.com.
Don't. Sell. It.
Not much at all but if Steve perry signed it then it might be worth a little more than if it was the current members