$5600 per 28-day period is quite a lot!
Yes, it's a significant expense even on top of an Apple salary.
Any company, not just Apple, should be tracking whether the extra spending is worth it. There must be a point of diminishing returns where additional AI usage stops increasing productivity at a comparable rate. That point should be your target. Different teams can have vastly different thresholds.
Companies also can't justify ever-increasing costs just because it increases productivity. It's business. You care about profits, not raw productivity. And Apple doesn't seem to be having a particularly great time these days.
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Could be $4,400–about 22 weekdays in a month. Still a lot.