Ask HN: Is it necessary to have a business model for your idea?

I have been following HN for last few months and this site gave me some wonderful tips about idea validation and things like how to bring customers or earn revenue. All such articles made me to think that for every product or idea, there should be a business model or a revenue channel. There should be a market and all that. What if something has come in my mind which would be solving my own problem. Should I just make it, for myself or for others or sit quite? I don't know whether there is any market for such site. Infact I just don't want to know because I want to think like an artist who just paint his creation without thinking whether people would buy it or not. I don't know whether user will visit my site, neither I know whether I would earn a penny. I just want to make it, I just want to create it, as an artist. Though like others every new idea come across make me to think about money as well. After all, I need money, lots of money to have my own home and for that I've been trying different things but no success yet but once, just once, I want to stop thinking about money,business plan and ROI stuff and want to concentrate on what has stuck in my mind. Am I an insane?(though your answer in YES would not change my mind), May I turn myself into an artist rather than some developer or some typical entrepreneur ? Thanks in advance