I also feel it's a breach of trust when you mislead the users you have implemented something in order to test demand. Never mind the ethics, it seems it doesn't

I also feel it's a breach of trust when you mislead the users you have implemented something in order to test demand. Never mind the ethics, it seems it doesn't always work: http://news.ycombinator.com/item?id=960721 http://news.ycombinator.com/item?id=960721