It’s not. You should try this on the testnet first.
Your input is wrong, you need square brackets around the receivers and basisPoints.
No. That’s definitely not right.
Are you connected as the contract owner? What is the contract address and what wallet are you connected as?
If you see a high cost like that it should also tell you that the transaction will revert or has an error.
If you see this error, you’re likely connected using the wrong address (i.e. not the owner)
Do not proceed.
Yes, I saw that error and didn’t proceed. But I was definitely connected as the contract owner.
Contract address: 0x7d5Bbd40663d81F506aaE6c430a13F1E298E703e
Wallet address: 0xb8c0dCEF32409bc46100b04Df5b8F14A72E7b334
Token 18 doesn’t exist yet, so you can’t set the royalties on it.
Ah yes, good point 
Has anyone confirmed these royalties get paid out? I did a few listings on goerli that have now ended and have been finalized (listingIds: 400, 401, 403, 404, 405)
I see no indication that the royalties are being paid.
Finalize Transaction: https://goerli.etherscan.io/tx/0xc09ae2e6bc513fd41d3a1929a645f2d2cd2cb33b10c531e6d7f69fe66f345b3e
Set Royalties Transaction:
https://goerli.etherscan.io/tx/0xe30b7dae9884c05fd5485374c56b38c4d2e04147a452e65749d9d3be02f6e5ff