Ok here's an one of mine
http://www.crossdresserdate.com/
I bought the domain name 10 years ago, put some dating software on it, did absolutely nothing, and years later looked and found I have thousands of (free) members. All from Google I guess.
I've done this with many niches but this CD niche had by far the most activity, maybe from the domain name.
To be honest I'm not that interested in diving into the niche so I'm hands off, but I would like to either
1. Partner with someone good who can build it up and make it profitable
or
2. Sell it.
*yes I know its not mobile
