We should think of allowing group mangers to monetarize their group. Members should have a place in their profile to include affiliate links so when they post in a group it could also pull their affiliate link and include it at the bottom of their post or comment. Every subscriber user should have this option setup in their profile with the option to include affiliate links in their activity feed post and group activity feed post. The site admin should have the option to offer this as a subscription package to allow users to have this option based on their paid membership. When enabled by the site admin the option should appear on the users' profile as an option.