I will implement the mute button and perhaps even players who are muted very often will recieve some sort of penalization (perhaps chat disable for X games).
I will think about the potion selling a bit more, but I will probably not implement that. Honestly I want people to use the potions, so if they have some and they are not able to sell them, they might as well use them

Anyway you got +20 coins for your valuable input! Thanks!