Guild Kickback System

I've been chewing over an idea of a way to benefit the guild. After an idea regarding the guild buying armor and selling it at half off; I came up with this, with some help from a few others:When guild events net us a large enough amount of gold, guild will get 20%, rest will be divided among the members. Carebears will benefit as well, if you farm and love doing it, you can sell your mats to the guild for a certain %/rate.. Give me your feedback and feel free to vote as well.

sounds good could really help gear up the guild with this system

I think there are pros and cons.

The system would need to be fair but should also favor those guild members that contribute to the guild in some way, whether by attending guild or alliance events, supplying mats, donating time, labor or gold, etc...

One risk, for example,  would be the taking advantage of the guild discount to obtain items for use by the member but for the purposes of advancing the guild in some way (gear or weapons to be worn in pvp events) that are then sold or are otherwise lost, with no repayment to the guild.

Another risk would be that some guildies may feel that others are getting preferential treatment and drama may result.  

Basically, if the system is implemented, it would need to be well structured and clearly communicated to all members.