It depends on the site and who the developer is.
There's a guy on here named MMORPG, he runs a company called DDIS-Group and they create a lot of websites for clients, they all basically use the same template with only some graphics changed. It's a good deal because he manages everything for you and all payments go through him so you don't get charged back for any transaction if you follow his guidelines.
Then there are people like me who develop websites for clients, but each one is developed custom so that no two are alike. I design each one as I get the order, and customize it to your needs. There are a few of us who do this on Sythe.