How do you "know" though?
There's always got to be an element of public acclaim, otherwise its just conceit.
Music is meant to be heard, getting it heard is difficult and some people will never get heard.
If it makes you happy brilliant, but I think few people can claim success based solely on their own opinion of their worth.
Not trying to be radgy mate ;) and essentially I agree with you but I think that any artist has to work pretty hard to get people's attention. It isn't enough to just have talent, you have to work hard selling yourself, and thats going to involve money somewhere down the line.