I guess it could be reverse trolling. I ran a CT yesterday, and we spent no less than 15 minutes waiting for people attempting to join in-progress, then dropping once they realize it's fresh. After they fix that glitch, they should consider fixing the issue with people dropping an instance because it wasn't 2/4. Withdrawing 3 times in a 30 minute period should yield a lockout for the duration of the content you're attempting to run.
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WoW Blackhand-US-Date of Retirement: 9/21/2010... /Sigh
Devari - 90 Rogue 85 DK Druid/Mage/Warrior 70+
FFXI - Shiva "Retired.... Or not? One more try, honest."
Desmar - 65 Sam 36 Mnk 18 Thf 12 War
FFXIV - Devari Garamond - Sargatanas 50 Paladin / Culinarian / Weaver / Armorer
Beta - Devaria Ariadne - Ultros - Pugilist