'Once you've entered the arena all harmful effects disappear.' - thats actually not true, all buffs and scrolls stay. I think fixing it will balance SA a bit, now 1 scroll is enough for 10+ entries(alt chars only for SA), it's all about who have better buffs/scrolls. After fix i think buffing scrolls inside every SA will be unprofitable(mostly for low lvl SA) and self buff fight would be fun.