Reduce selling fee in Opensea

This is introduction of product I am building now.

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Average fee including creator fee is 10% in Opensea.

Sellers need to pay it.
But isn't it too much?

I thought it is too much and building a NFT marketplace for P2P transactions.
You can sell NFT with only gas fee.

Also, it can be used as messanger webapp.
You can send a message to any ETH address.
But it is centralized messanger webapp.
I think if it is decentralized, people don't use it because of gas fee.

Do you think is it good idea to build this product?

If not, why?