I completely agree sigils should be removed from all pvp/pve game types it removes fairness for those who cant afford sigils.Sigils shouldn't work in the arena or duels. How much cash someone spends on their character shouldn't affect fair play when it comes to pvp.
Sigils were meant to reduce recovery downtime, not for cheesy way of healing during pvp.
*Side note sigils work while eshield is active as it doesnt put the mage in combat while druids abundance doesnt so a mage with some hp and energy sigils who gets close to dying can use eshield again and heal back befor sit breaks and probably finish off the other person.