In the link below are current gas fees for doing contract interactions on two popular NFT platforms

Why does it cost so much more to list an NFT for sale ($150) than it does to place bids on NFTs that are in auction ($50)? A detailed explanation on data usage on the blockchain comparing these two different contract interactions would be really helpful.

And do the NFT platforms insert some sort of hidden commission inside of these two different smart contracts somehow, or is really purely gas fee only? By inspecting a platform's smart contract, how can we tell?

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