"Who's going to pay for that much printing?"
Start by tracking costs by user, department, client or custom shared accounts.
Get further control by allocating print quotas to users, departments or clients. They can track their print balances, and once the quota is gone, it's gone!
Implement a pay-per-use model to recoup printing costs. For individual user payments integrate with popular payment gateways. Or make client billing seamless by allocating costs to a client, project or department.