Random arena is famous from players leaving their parties, because "no monk", "4 mesmers" or any other reason. This destroy the fun of play this arena by normal players. My two ideas how to reduce this behaviour.
1) Make a new title "coward" or "leaver"
Each leaving a party before the end of a battle add point for this title. After gathering a certain number of points, player receive this shaming name. The title is assigned to the account and cannot be hided by player. After certain time or certain number of battles with friendly behaviour, points are slowly decreasing, so the player is not punished forever. In this way "leavers" will probably have really big troubles to be invited to any party in TA, HA or even in PvE.
2) Lower factions reward
Leaving a party before the fight is finished effects in not receiving factions by a leaver in next few fights.
c

