Half life community has that the hardest of all i think but other communities do experience the same last few years. Unreal does anyway. Also its not just about being bought by the creator of the game but a lot of those modders think a 3rd party publisher might buy them or even more common, they try to do as pro as possible because then some company will take notice and hire some of their members..
Modding became a stepping stone to a carreer rather than fun hobby projects......