..and if you want to customize them you'll probably still have to rewrite lots of stuff.
To make it very short:
If you are an indie game dev then you dont have much time. You will not earn much with a small game. You have to make them fast and efficiently and release them on many platforms if possible.
If you are a hobby user, then all this does not matter and you have all the time in the world to customize, learn, optimize, plug-in, add-on and trying to keep pace with the other ones while not really progressing on the actual game. But as Slin told, some of these users dont want to make games, they just have fun with technology. And I understand this, I love technology as well
