J’ai eu une première réponse, « vous n’avez pas parlé avec moi sur KS, Luca est malade, pouvez-vous me rappelez ». Je viens de réécrire un mail, l’affaire continue, j’ai réussi à placer cette fois 2/3 amis pensent un peu pareil. On va voir si ça aide 
[EDIT] Voilà la réponse, Hello,
I am sorry to hear your disappointment.
Unfortunately, due to the materials, the illustrations, the magnets and every detail we put in the game, the game has a cost and it is more expensive than others.
I can explain to you what happened. We did not think we’ll reach that high. While we had the other characters’ illustrations already mapped out since we were already offering them to the public, the Gatekeeper was not scheduled to be in this campaign. Despite the character being defined already, we needed more resources to actually have it in time and produce it with the others. We risked already by lowering the Whisperer goal and we could not risk any further, especially from a financial point of view. Trust me, it was a very hard decision, but we would have been losing money if we placed it lower because, again, it was at first not calculated as part of the campaign.
As French and German were not going to be part of this campaign, but we decided to add them in because they were strongly requested by the backers.
Keep in mind that the retail price for the game is €69. For that price, in the campaign, backers are getting two extra heroes, one of which is an exclusive.
With all that said, this is our first Kickstarter campaign and we have learned and are learning so much about Kickstarter and our community. The only thing I can do right now is promise we won’t make the same mistakes in the future.
I am sorry this is probably not the answer you wanted.
All the best
En gros : Je pense qu’ils ont été surpris de leur score (la confiance règne chez eux), ils mettent en avant un cout cher mais me disent qu’ils avaient déjà des persos sous le coude, en termes de production je n’ai pas le savoir pour dire si avec 8 750€ on peut se permettre d’offrir à ses backers l’extension.
Je me laisse encore cette semaine pour savoir si je m’engage, mais un veille adage dit si tu doutes laisse, donc à voir 
PS : j’espère ne pas avoir été chiant mais je suis content d’avoir eu les arguments