Being an association representative isn't easy. You can talk yourself blue about all the great things the organization does - lobbying, insurance, collective bargaining - and inevitably, the potential member's eyes start wandering off, or they pull out their phone to catch up on the latest Facebook has to offer.
This is why someone invented member benefits. No matter what the core function of the association is, members are always going to need something a little bit more tangible. More often than not, these benefits are what make the difference in convincing someone to join, then convincing them to stay on as the years go by.
Discount programs are extremely popular for this reason. They make the "why you should join" conversation very simple.