There is some evidence of this - if you can log in to app store connect (need a developer account) there is this page:
https://appstoreconnect.apple.com/apps/pricingmatrix/1539646...
It shows the tiers from 0 (free) to 87 (USD 999).
Then come the party tiers: 510, 530, 550, 560, 570, 580, 590 which are just repeats of the other tiers, probably for some good historical reason which I'm not aware of.