Quote Originally Posted by Kuwagami View Post
=
Because once a content isn't locked anymore, it loses about 80-90% of its value on average (T9 clears fell from 100m to 15m on 2.4 patch day) thanks to the fact that the run sellers don't have to "free" a spot with someone who doesn't get a chance to loot this week. Also, it allows more groups to offer their services, naturally decreasing further the prices.
As someone who has made millions of gil per day, selling runs. I can tell you the money is in the unlocked content.

The occasional locked content buyer sale might be more gil in 1 run, but the whale is the guy that buys 20 farm runs.

The trick is to be able to 7 man the fights before any other groups.