This is a good idea that takes away the "crappy guild quest" problem.

I would love to see this implemented but with small rewards - my guild may swap 2-3 SLT's or sometimes 5-6 BK's per active player in a weekend, plus we already do most guild quests, so I can see how the market would quickly be flooded by guild coins.

Assuming we swap just one BK per day three ways in guild, then those three players EACH get 21 BK loots per week... how many guild coins do you want us to have?

As a small reward, max 25 guild coins and not affected by premium, this is a great way for active adventurers to supplement guild quest income. Giving more guild coins? Then they become pretty worthless...