Fell Cleave shout Mules increase?

Not all FCs were RMTs. For a while, there was a group that was run by a small linkshell that was working on getting a relic weapon for their member in the shortest amount of time possible. They'd have a core party of six (including their own keyer), and invite 12 slots for 200K for four hours. That would be a cool 2.4 million gil each night. They did that several nights a week, and then the guy eventually got his relic and they stopped and went back to Empyreans.