Both of mine (https://www.s3stat.com/ https://www.s3stat.com/ and http://www.twiddla.com/ http://www.twiddla.com/) are turning nice profits. There are dozens o

Both of mine (https://www.s3stat.com/ https://www.s3stat.com/ and http://www.twiddla.com/ http://www.twiddla.com/) are turning nice profits. There are dozens of other people here running successful single player businesses. The nice thing about having a single person is that you get to define Profitable as "income minus server expenses" rather than "income minus server expenses and everybody else's fixed salary". You also, if you prefer, may choose to define your own salary as "income minus server expenses", which gets to be a very nice thing after a while. There are lots of other nice things about running a business by one's self. Dig around for old threads here on the topic for more examples.