World Item Buyers

This is very simple. If you try to sell an item buyer something a screen with how many emeralds you would receive come's up and there is a green and red wool that say you and no if you click yes you sell it if you say no you keep it.

 

The problem is it is random...
It would ruin the system

 

okay i one sold level 45 boots and got 2 emeralds so sometimes they steal your money but i see your point

 

It completely randomizes the amount of emeralds you get. However, I believe that the parameters for prices go up depending on level- You could incorporate the suggestion so that instead of just saying i = p, the screen could be i = ap-ap. (i being item, p being price, and ap meaning average parameter.)