I see no problem with the mercenary use of mercenaries.
The post is clear about what loot is available to non-members. If being blocked from Tunare's unique loot is a deal breaker, then obviously don't attend. Or bring your own raid force to kill Tunare without Awakened's help
[You must be logged in to view images. Log in or Register.].
As it stands, PoGrowth clears are a decent way for melee to get equivalent to Thurg quest bracers, or classes to get their BP click abilities, without having to spend a small fortune on gems.
I'm sure for some the event will be worth it for that alone.