The dealings with the Midas kingdom had gone well thanks to Betsy. He trusted she had a plan that would work. She had disrupted their plan. They would still have been better off without the guilds at all, but it seemed to be the best idea. Kurt got his glassblowers. They were supposed to tell the techniques for the paste as well.
The problem is that the secret is the goblin magic without which the whole process wouldn't be worth it. So even once they figured it out they wouldn't be able to replicate it. Betsy knew that as well, thinking the King had planned to do that after the negotiations. Knowing he would find nothing he could do, she played the outward negotiation harder because the internal struggles were on their side. There was no way to replicate what Wellspring could make without the other creatures. She had made everyone almost happy. There were some percentages she wasn't pleased about as well, but found herself pleased with the overall deal.
