Then why do you think almost all websites have a constant design change? They are not just doing it for the sake of new features, they can do that with the old design anyway, but they change it, hell even google moved one of the letters one pixel to the side, why? At the end of the day better design is better, and same design makes it boring after certain amount of years, I am sure that all marketing departments would agree with that. In the end when you have millions of dollars in profit, and you have all the features you want, and you are basically giving away free LAMBO! which is insane to think about, then whats there left to do?

The only thing you can do is the fact that you can basically just change the design and give a fresher look and make the website fun again all over. I believe a much much much better design can be achieved and that would give people a chance to gamble once again with love, instead of boredom.