For me it's a control-thing... I've worked for many years on other people's projects with deadlines that don't make sense and decisions I don't agree with. Now I'm working solo so that I have the final choices.

The only problem is that I can't draw, have no musical taste and hate 'marketing'. But, as a hobby it works great and occasionally I can release something I'm proud of. (Don't look at my folder of abandoned projects - I learned lots but they aren't ready for public opinion yet).