I think you have hit the nail Gerco. The product has some content, and about 4 years of consistant income. But I'm bored with it, and it could go up or down at any time.
Let me just say it, the website is
www.rentyourdot.com
About 600 customers, and 5000+/- websites hosting content, and since it is based on SEO, could go up or down at any time. At it's peak was doing $1000/day with about 49,000 websites. Never quite hit the 50k domain mark.
Now it's down to about $600 a month with about 5000 domains. It's pretty much self-run with new customers signing up and old dropping out without any intervention from me.
But I'm bored with it...