I've been a member continuously since first registering in 2012 & got the last year of minis with the number on them, I guess. The initial sign up disc is usually pretty (black with gold foil stamp, I think, every year?), but the mold changes from year to year. Membership card has some discounts on hotels and stuff similar to those available for any other similar sized group (30-35,000 active members, I think). Annual key tag is OK, and the quarterly magazine gives me more of a thrill when it arrives than I'd expect (my only magazine subscription).
For me, playing at least a dozen sanctioned events every year, including at least one bigger event (BG Ams, Ledgestone, Worlds...) means I definitely make it worthwhile price-wise. And having their rating to force me to focus myself and do better, if I can, is a big plus. On top of all that, I like supporting the sport, and it's the international group, so...count me in!