Plutonium

Abandon option would be good.

Agreed.  At the very least, the ability to simply abandon a relic.  Make it part of the Guild attributes so the Guild Founder can assign who in the guild will have this ability or not.

How about we just add the ability to abandon a relic after a week and call it good. The relics worth taking will be taken anyway, and the ones that aren't can left behind.

True, but part of the fun would also be seeing a relic suddenly disappear from a guild's posession, thus making player run back to the relic to reclaim it.

What's the point of this?  Market values of any item are determined by what someone is willing to sell at a price someone is willing else is willing buy.  Nothing else matters.

Agreed.  Price is determined by the supply and demand at the time.  Often, I've puchased an item, only to come back a week or a month later and see that the same item is selling for half of what I paid.  I have also purchased items, such as the Forest Cave Potion for 40K in gold, which is now currently selling for 1 FSP, with only four or fave showing as available in the AH. 

It's all about the supply available and the demand for that supply.