Related Clues:

• End --- (ultimate customer)
• Product buyer
• Self-serving opportunist, perhaps
• Exploitative sort
• Utility customer
• One who has logged in
• Manipulative one
• Target of certain fees
• String puller
• One logged in
• Computer owner
• Sadist, e.g.
• Friendly opening?
• Internet patron
• One who isn't 'clean'