> The problem is that it then gives the developer weird incentives. If someone in the community decides to build the same feature that the main developer kept a

> The problem is that it then gives the developer weird incentives. If someone in the community decides to build the same feature that the main developer kept as a paid feature, then the main developer won't want to merge it into their version. See VirtualBox, and to some extent Chrome. For VirtualBox, I'm sure that the Extension Pack could be covered with an open-source effort by the community, and in the case of Chrome, their refusal to accept *BSD patches.