Lottery system for raid encounters

[OriginalQin]

Someone mentioned a lotto idea in guild chat and the more I think about it, the more I like it. All this poopsocking, FTE arguing, petitioning GMs... the p99 end game is not very appealing, even with the new official proposal. A lotto system seems much more simplified and very effective in eliminating or reducing current blemishes on the p99 raid scene.

Lotto system:

Rules

• All guilds that wish to compete have a representative roll a /random at a designated time after a raid target is downed (say, 6 p.m. Eastern the day after).
• The winning guild has first priority for the target's next spawn. There can be a window of time, say 12 hours, for them to complete.
• If the guild wipes, the guild with the next-highest random roll takes priority. Etc.
• Members from a guild other than the priority guild may not participate in the fight.

Benefits

• No need for lists of guilds with class A and B.
• No need to calculate the percentage of all possible raid targets for each guild each month. (Less administrative work.)
• Any guild that feels they have what it takes for an encounter can at least take a shot. This would help newer guilds trying to carve out their own place.
• Raiding viability will not be as limited to people who have the flexibility to log in during the middle of a workday or at 4 a.m.
• No more need to have multiple alts camped out all over the map.
• No more bickering about FTE.
• No need for spawn time variance.

Risks

• ???

Requirements

• Administration of random-roll tracking.

What makes this idea worse than the official proposal?