I'm an interstate MCC member and pay the extra $85 for the MFC duel membership. I actually still get to the G for maybe 10 games a year.
From memory I have got offers from the MFC in regards to games in Sydney and also pre match functions at maybe the Duke in Melbourne? I don't think players are in attendance but at least the club attempt to offer something up.
I see my MFC membership as a donation. I signed up when I finished uni and could afford it.
One year the club rang me and said I had paid my membership twice. After saying it was fine and I would just donate it to the club, I called back up and asked if I could sign someone else up. They were more than happy to help out. Was pretty happy that the MFC membership pack arrived in the post a week before Christmas for my Geelong supporting mate. He wasn't impressed. Especially when he didn't renew his membership and would get calls from Dees' players trying to get him to renew. He tells a particularly funny story involving Dean Kent..
I think the people that don't sign up as duel members just don't love footy as much as the rest of us. There is nothing wrong with that it's just the way it is. If people don't care enough, you are going to struggle to convince them to sign up, irrespective of the cost.