$1,000? According to ccusage, I used around 3,200 USD worth of API credits last month, but I'm on a plan that only costs around 100 USD per month, and I'm not even a heavy user. At the end of each week, I have typically used about a third of my weekly Claude limit. So either their APIs are heavily overpriced, which seems rather unlikely, or they subsidise subscriptions to the tune of 100x or even more.
Why do you think the API being overpriced is unlikely? Seems pretty likely to me that sub sells at cost and api is the massive markup they force on enterprises.