That has to remain the principal reason for doing it, doesn't it? I know it's possible to write for money, and many very good writers have done so. But for me, it has to remain the principal thing that I actually want to do the writing.
The one thing that scares me the most is failing. It scares me that one day I won't be at this level. But while I'm here and while I'm having success early, I'm trying to do everything to stay on this level.