Sell an information product. They don't really have to have either maintainance or support. I have an ebook out there that I haven't touched for about 2 years.

Sell an information product. They don't really have to have either maintainance or support. I have an ebook out there that I haven't touched for about 2 years. I check the email address associated with it about once every three months. It's still selling. However, you are absolutely right - maintainance and support can turn a passive product into something Not Passive At All. It's something to watch out for very carefully if you genuinely want passive income.