[Bug/Exploit] NM Faction leve abandonment

Platform: Windows 7 Ultimate 64bit.
ISP: Cox Cable
Type of Internet Connection: Fiber Optic
Internet Connection Speed: 31Mbps
Date & Time: Apr. 19, 2011 0900 CST
Frequency: Always
Character Name: Reika Shadowheart
Race: Miqo'te
World: Karnak
Class/Skill Rank: Gladiator R50
Physical Level: 50
Area and Coordinates: Camp Bloodshore
Party or Solo: Party, 8 members
NPC Name: None
Monster Name: None
In-Game Time: 2000

Steps:

1: Member started faction leve Wanted: Mammoth and Master.
2: Member abandoned leve before any fighting started.
3: Member re-joined the leve
4: We Killed both enemies and completed the leve
5: Member that abandoned still recieved a Allagan runestone from the chest

It is an exploit people can use to have a chance to obtain Allagen runestones each reset period, without having to re-gain faction points through regular guildleves.

Don't know if this is ok to do or not.

Edit: actually an in-game GM said it was a No-Go.

Greetings Reika!

Thank you for giving us all the information that we need. We will be forwarding the concern to try and get it resolved. I can see people abusing that method and could cause some trouble, so we do appreciate the post! Any updates will be posted within the forums as they become available.

Greetings again, Reika!
Thank you for your patience with waiting for a response to the investigation. After thoroughly investigating the matter, the development team did find this to be a potential problem with the game, and the matter is being worked on at this time. I recommend keeping an eye on both the forums and http://lodestone.finalfantasyxiv.com/pl/index.html for any news about any further developments. In addition, it is highly advised that players refrain from replicating this, since it would be considered a very serious violation, and serious action may be taken against players if they are found to be in violation. We greatly appreciate the heads-up!