

That’s because it’s a passport card. Cards are only useful for crossing into Canada or Mexico, or for some carribian islands.
More importantly, it’s not valid to use for entry via airplane anywhere, even if it’s one of the above. So basically most useful for people that commute between regularly or are going on cruises. Or in this case as proof of citizenship.
Full passports are $130 USD. I renewed both in November.

Not at all. And it’s a little cheaper than my state ID (which is not a driver’s license, just an ID) and lasts considerably longer (10 years like a normal passport instead of 2 for the state ID).
Its great value, if you don’t already need a license and don’t plan on doing any air travel.