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If the plugin is working with ad listings, Dale Miles could probably extend it to blog posts as well. Wait for his reply or send him another email in case he just missed it.

Give them access to the back-end then. Comments is a WordPress feature and normally users shouldn't be able to edit their comments.

You have many options...
1. ClassiPress - Settings - Advertising
2. Use text widgets, place them where you want and insert your code there.
3. There's a plugin in the MarketPlace called Banners...