The biggest problem is, even tho he's rich AF, he doesn't even drop a single gold coinLol, just an option for the desperate.
Just read the wiki I linked to you, it contains most of the information about him and more. If you do the main story quest (the Noer guild quest at the bottom of the questboard) involving Cecily then you'll meet him anyways, there's no way you can miss him.
As for the consequences of killing him, from what I experienced, none, just morality loss. He's just going to be missing from all the quests he's related to. No bounty hunt against Lona for killing him.