I've bought and sold many things on Kijiji.ca. I am a private individual, not a business.
Though I do receive offers for additional services, such as to bump my ad up, post a web page, etc, I have NEVER paid a penny to Kijiji, and have never had my ads pulled (I've sold things that were up there for many, many months; I just had to renew the posting with one click, when they sent me a reminder email).