Starred (*) suggestions are likely to produce more than $1MM in additional revenue
Offer group owners the opportunity to have their groups featured in a group directory
Members who want to subscribe to more than 50 groups must pay a monthly fee
Offer featured group postings to potential advertisers - advertisers can choose the target groups (share revenue with group owners)
(*) Break member profile web pages in 2 pages, to increase total page views on the network and thus increase revenue from CPM
(*) Offer a differential job pricing structure - not just a flat fee for a static product
(*) Accept job ads from external websites (become a job ad broker)
Members with 3,000+ connections: charge a monthly fee for each additional 1,000 connections
Offer advertising in newsletter and in all email communications (e.g. when a group owner sends an email to all her subscribers)
(*) Create and host mailboxes, and offer advertising in member mailboxes (any time a member send or reply to an email)
Lower minimum requested CPC to below $1 per click; apply same idea to CPM
(*) Design intelligent ad routing / behavioral targeting system: this will help you keep a high CPM, because the CTR (click-through rate) will be much higher
Redistribute your ads on other networks
Offer members to pay a fee for fast processing when they submit a ticket