My guess is that the Ace Ticket sales reps on the phone get a commission, and that Ace Ticket purposely doesn't include the seat numbers online so that you have an incentive to wait until they're open and call the sales rep on the phone.
What is 'Collective Bargaining'. Collective bargaining is the process of negotiating the terms of employment between an employer and a group of workers.
The overall goal of the collective bargaining process is to reach a collective bargaining agreement that will govern the relationship between the employees and employers including such matters as wages, benefits, hours, promotion, grievance procedures, and other conditions of employment.