just developing the site and then what? sell it or also operate it yourself?
you have already done the most part of it that counts, and if the game you designed is as easy to play and as interesting as it sounds like then it can be successful. if you just developed and want to sell it later then it can be profitable for you.
but if you plan on operating it yourself too, then you have to invest some more money into your own project to make people pay attention to your game. they won't come on their own. and you can grow it slowly but it can happen, market is not full yet.