The outcome of these finals could be important to the tour next year. Some success for Bellucci will get him in seeding range for the Australian Open and make him a commitment player for next year.
But if he couldn't achieve that throughout the year why does he deserve that chance? The same thing you said could be said for Benneteau or Baghdatis or many others
Fact is there should be no WC to a "finals" event but i can accept a WC if they really want to include a Brazilian but they should pick one who plays challengers otherwise this event loses all meaning