Game budgeting is not a zero-sum game as you seem to think.
Publishers don't allocate a single pot of money to finance a game project and when it's done there's no more. In reality, games don't have a fixed budget. They have an estimated budgetary cost for development, then a separate marketing budget---out of which shit like celebrity VAs is paid.
Then the project gets executed against project milestones and the final project cost is tallied up at the end. The project costs whatever it costs, and the project manager's performance is measured against how close to the estimated budgetary costs the final project cost landed.
VA is also something that started well into the full production of the game, so no publisher is cutting back on their dev schedule to accommodate more expensive voice talent. That's such a dumbass argument I can't believe you guys are still trying to push it as credible. It's absurdly obtuse.