I mean create contract with logic that for seller this token will be have price 1*X eth, X > 1, and for buyer it will be 1 eth
From your logic and it seems like you wanna create a garbage token that will give advantage to the developers to farm the money and the buyers were being scammed caused by the price will be going down into the 1 ethereum. lolWhy don't 1*x for seller = 1*x for buyer? If you are wanna taking profit from selling your token and buyers will be loosing the value from your token and you're the same like scamming others.
No, developers should get money only from fee.
In my idea, the seller is not the owner of the contract. I mean the seller is the owner of the tokens who buyed and wants to sell them.
The logic is:
1. Person A buys 1 token for 1 ETH.
2. Person B want to buy 1 token for 1 ETH in the Person A.
3. Person B will spend 1 ETH and will get 1 token
4. Person A will get 1*X, X>1 ETH
Then Person A made a profit in X ETH, and Person B can make a profit when he will sell tokens