Fair point. The problem is there will always be someone or some group which will exploit whatever they can.
I totally agree with you in your scenario. The problem in that case is not the group invis but rather the absolute lack of respect of those players who use it to snatch a real effort from another group and steal the boss kill (I could even go as far /petition to have them banned from the game for unfair play, but then again it might be too drastic and someone will have my head for even suggesting it
).
On the other hand if you are soloing it can help a lot to be able to get closer to the boss and kill it without dying 500x before.
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Arkrnum : Raki Sorcerer / Minerologist
Sideroth : Kurashasa Necromancer
Siul : Vulmane Ranger
Shadows of the Dragon Guild ~ Gelenia Server
www.shadowsofthedragon.com