>Most of the value of Unreal or Unity is that the tools are already there and they more or less Just Work and a lot of people know how to use them This is a ve

>Most of the value of Unreal or Unity is that the tools are already there and they more or less Just Work and a lot of people know how to use them This is a very good point I missed above - people - the fact that lots of developers and artists are already experts with the tools lets you hit the ground running and focus on the game. With a custom engine you've got all the training involved to use your custom toolset.