A domain that earns via affiliate commissions. I write a blog post every now and again and swap in different offers from time to time. But it works very well for the amount of time I invest in it. The companies I work with offer lifetime commission on referred customers.

About once a week someone calls or emails me, and I just send them a standard email about what a VPN can do.

When I get particular good offers (Black Friday for example) I fire off an email to the newsletter which has about 200 subscribers I think.

The site takes less than an hour a month to maintain.