A level 2 two participant might have active email and URL links - and might be allowed to include images and expanded product descriptions for 5 products. And, he might have the ability to have 20 products with expanded description and images. What you include, and what you charge for each level of participation is up to you. Banner Advertising You can offer banner ads separate and apart from the participation levels. This is an additional revenue source.
Banner ads rotate throughout the entire site.
Each ad has equal weight and an equal opportunity to be viewed by any visitor to the site. As visitors move through the site - each time they go to another page, they are presented with a new ad. Each time a new user visits any given page he has an equal chance of viewing any of the ads. Banner ads record 'impressions' or the number of times a visitor has viewed a given ad - and 'click throughs' or the number of times a visitor has actually 'clicked' on an ad and followed it to the members own web site. Because you control the content on the home page and on each category and subcategory page - you can offer sponsorships that appear on these pages.