It will move to the "expired" section of the account bans. The 2 day ban is a permanent record on the account. It is unlikely that even after 1 year. you would get another chance. certainly not worth risking
No it does not. The MS increase/Decrease is how quickly the game state updates on the mirror client, therefore affecting the speed in which information is received by the script to act on.
The easiest way to visualise this is set the reaction speed high. set the client and official client side by side. Teleport somewhere and see how long the client takes to show the new location.
From my experience, most websites won't buy orders less than 50M (from about 6 I contacted in the past this was the case).
This is also about 18 months ago, I rarely sell gold now so I don't know what the appetite for GP is atm