Actually, the "success" of Unions is probably how we got into this mess to begin with. Nobody rationally goes into one expecting to get any Dynamis currency (let alone a meaningful amount), nobody really wanted Sidhe weapons even when they first came out, but everyone will sign up because free vendor trash with EXP is better than EXP alone. S-E looked at that how frequently people signed up for Unions, considered it a success, and implemented it as an endgame activity.
And then they were surprised when people left Campaign for greener EXP pastures. "Don't they know they can get Dynamis currency?" they're probably still asking themselves.