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.
3. collective-set up on the principle of collectivism or ownership and production by the workers involved usually under the supervision of a government; collective farms. socialist, socialistic-advocating or following the socialist principles; socialistic government.