Context behind Nahash's two tales, in case it isn't obvious enough already:

The first story, that of the Maiden, was of an arranged and extremely unhappy, imbalanced marriage. The maiden wished for nothing more than the death of her 'beloved'. Nahash sympathized with her situation, and provided her with a knife and an unlocked door. The rest was the maiden's doing.

In Baudry's case, his wishes for revenge and more wealth were halfhearted, without sufficient fuel for Nahash to craft anything that would truly fulfill the bargain. Furthermore, Nahash believed that such an ending would be dull and uninspired. So instead, she guided him towards the end that would truly satisfy him: A way to escape from the life behind him. He would later fall into her service, due to her long-time influence, and a large number of his descendants (he had a lot of children) still follow her guidance.