www.golfingstat.com
I had never really created anything before and wanted to learn Rails.
Built it and have been paying $10/mo in hosting for the last two years. I use it and have around 30 active users (couple hundred non-active). So I kind of keep it going just because I realize that the 30 people who use it have invested a lot of time entering scores and stuff.
My monetization strategy was to get traffic and rely on Google ads.