About control on vatsim, if his VA gets busy, it will attract people to control there and fly there. That is what happened in Malaysia with MVA. WMKK was rarely controlled in 2010 when MVA started, but once we got going well, it was controlled more often and more people flew there. So a VA can have a big influence on an airport getting controllers on vatsim. Nothing wrong with some competition, and if his VA is good, people will choose his VA over flyuk. Aircraft do have "days" off for maintenance. If you can devote sometime to it, then by all means go for it. And you do have great scope for expansion with that model.