No one closes a profitable business. You either sell it or hire more people while you do the other thing. Someone else happened and I'm sure it will come out in a few months
It is their choice on what to do with their business,if they have other plans then it is their choice to close down as i am sure i wont run a business if i am not able to focus my entire time in what i do,and so i can understand their decision in closing down the site so that they can pursue other dreams .