I have been a member since Day 1. The reward cards are neat and will probably be collectors' items in 50-60 years.
On the serious side, you do have to accumulate a certain number of points before you can get a card and then be able to transfer your points to it. The points do expire, but it takes several years.
Lord High Keeper of the Knowledge of Right and Wrong, Counselor in Moments of Temptation, and Guide along the Straight and Narrow Path and Oldest Active DWT/WDW Radio Member
DL: 1955* (1) WDW: 1977* (2), 1980* (2), 1985* (3), 1989* (3), 1996 (ASMu-3), 1999 (ASMo-3), 2000 (ASMu-2/PO-2), 2001 (ASMu-5), 2002 (ASMu-5), 2003 (ASMo-5), 2004* (8), 2004 (ASMo-8), 2005 (PC-10), 2006* (15), 2007* (20), 2008* (22), 2009* (26) 2010* (27) 2011* (32) 2012* (39) 2013* (36) 2013* (15) Total Days @ Parks = 294
*Off Property