So coming from Lineage II - Speaking from experience of epic sized raids - http://www.youtube.com/watch?v=6ChJuUo4uBo

The size was epic, the content was not. Hours of fighting toes, people dying everywhere, people leaving, bathroom breaks, food breaks. The idea was great, but when put into practice it really lacked the glamour and glory.

Also watching i110 people wipe on Titan hardmode - still! While Light farming as lead me to agree with the team that giant raids 25+ would just lead to mental anguish.