You can find numerous articles describing how to attract more visitors, convert them into customers, and then cross- and up-sell them to different membership tiers or add-ons. However, one item that is not described often on popular SaaS strategy blogs is another aspect of revenue generation: how to make money with success penalties and user lock-in—perhaps because it is not very customer friendly. It is a strategy worth exploring since the biggest SaaS vendor, Salesforce.com, seems to be successful with …