All of the above. It's just words on a screen. I go with my 'flow'. If it attract readers, I get enthusiastic and want to write more. Less readers, low scores, I won't write as much.
I have thought about becoming more serious about writing however. But I don't feel I know enough about HubPages to do it. I also try to stay away from 'negative' hubbers. I respond to constructive criticism, not harsh words.
I write for other sites as well. It's mostly Q & A though. I feel that HubPages is the only site I can write articles and gain ideas for every day life. I have to admit though, I enjoy reading and commenting more than hubbing. My inspiration comes in spurts what can I say?