I enjoy inventing things and completing challenges. I think this trait is common among engineers. Unfortunately it doesn't make much practical sense in a lot of situations. I have entered Ludum Dare multiple times and each time I failed to finish a game because I end up spending the whole weekend writing a cool particle system or whatever. When I'm left to my own devices without planning, who knows what kind of thing I'll end up making.

The decision to invent should be made intentionally, rather than impulsively. If your goal is to have fun, then have at it. But if your goal is to launch a product, it's not prudent.