Sorry, but I think some people are trying to make Cityjet look a lot better than what it really is. My boyfriend was a captain in wx and he never ever made 9000 euros/month. On a better month ( working maximum duty time ) he was making around 6000 euros. You are probably adding the 2000 euros that captains got for moving from CDG or DUB base to go to LCY (for a year only). Then I guess you can add up few hundreds if you are instructor or line checker.
Anyway, in the end the money is not everything. You will find out in the long run.
The atmosphere is still good in lcy cause its still new and people are still motivated and lots of them have the leaving allowance ( but for only a year)!!