Final answer:
There is confusion in the question posed as it references characters Dwight and Nellie, which do not align with the provided text snippet discussing Nora and Helmer from 'A Doll's House'. Without additional context, it is not possible to accurately answer the question about Dwight's participation in Nellie's charity project.
Step-by-step explanation:
The question concerns a character named Dwight and his reluctance to participate in a charity project spearheaded by another character named Nellie. However, from the provided information, there is no clear reference to a character named Dwight involving in Nellie's project. Instead, the text snippet provided refers to a conversation between characters named Nora and Helmer from Henrik Ibsen's play 'A Doll's House', where Nora considers what she can do that would be meaningful and discusses Helmer's business activities at the bank. This indicates likely confusion with the question asked, as it seems to be referencing different characters and settings than the provided text. Without specific context or reference to Dwight and Nellie's project, it's not possible to accurately answer why Dwight might not want to join Nellie's charity project.