Is that intentional because the Fabulous Five are con artists?
Edit: Just checked, and sounds like more than a few people on Steam are running into the same issue. Cecil doesn't offer any additional information for them. Maybe it's bugged.
I never know how to handle that group. When I pass up on their offer to join, I feel like I'm missing quests (technically I am). But agreeing to join them sounds like such a bad idea.