Hi, I already have a mmo social browser game script that I built, it has full admin panel and security system, all with many functionalities built inside of it. I initially built but I ended up closing it, no longer have time to take care of it. I also have logo, graphics, video trailer ready with source which you can edit and can give them included in the price.
Can also set it up on a server for you with good monthly price at the provider and great resources. If you also want the domain name of the original game it's an extra $1500 or you can use own domain name instead and just change the name of the game.
You also have subscriptions and premium items inside the game which you can sell to players, you can set own prices from admin panel. Contact me if interested and I'll send screenshots so you can check out.