I've found that although I spend a lot of time gaming, in sandbox type building games I prefer creative mode. Why? Because these games are all ready huge time sinks, why make them larger by having to go out and actually gather the needed resources? I'd rather spend my time enjoying the creative aspects of the build. I've recently purchased Space Engineers ($19 on Steam) and have chosen to go the creative route. (Purchased after posting the Space Engineers thread.) Looking at some of the behemoth space ships built within this game, I imagine most of them were built on Creative mode.