I wrote recently about the options around doing membership cards for CoasterBuzz Club. Basically I'm going to do... nothing different. Obviously a lot has changed in a dozen years, but there are almost no compelling reasons to go plastic and many to stay where I am.
The thing is, my printer was fully depreciated years ago, and I don't want to buy a new one for plastic card stock. The difference in cost between the paper punch-out cards and plastic is about 12 cents compared to almost $1.10 when spreading out the cost of the printer over three years. That's not worth it. The margin on memberships is already taking a hit from the credit card discount rates, which keep getting worse.
The other thing is that there are all kinds of electronic means that I'm thinking about as a secondary means of distribution (or primary, if certain parks will take the lead). As you might imagine, thinking about how you do things like this is part of my daily routine, working for a theme park company. I've got some ideas that I might look into over the next year.