And it is a card that is completely worthless. Save your money. The only card that matters is OW, and AOW may help you on vacations to avoid checkout dives with some operators... it depends on where you're from... an OW diver from the PNW would generally be considered to be "more capable" than an AOW from Idaho, but whether or not you need a checkout dive will in large part be determined by how you talk and carry yourself.
I know of dive ops in Cozumel who will take you into Devil's Throat on your first dive with them if they feel good about you, or who will limit you to Paradise Reef if they don't, regardless of whether or not you complete a checkout dive with them.
Don't worry about card collecting. Get the training and experience that you want, but unless you're planning to continue into being a DM or instructor, the only thing you need is AOW, and I would recommend rescue. Screw the specialties. The only specialties that I would consider worthwhile are wreck and cavern.