I'm pro ALPA and contribute $50/mo to the ALPA pac, but I would never again want to be part of a newly organized ALPA pilot group. It sucks trying to negotiate your first contract. Management is FAR better equipped to deal with a newly formed union than the union guys are in dealing with management.
As I usually advise regional pilots...Any time you spend working on ALPA related things is time you should have spent working on resumes and applications. You need to get out of there, not try to make it better.