@Jim *******
a pink ID card can be mandatory for keeping SSO (social security) paid out of pocket after having worked in Thailand for minimum 12 months. If you get laid off or resign, you can keep the SSO for a minimal monthly fee, but it often requires a pink ID card.
That's about the only thing I can think of though.
So absolutely not for everyone.
As Brandon mentioned above, you might get Thai price at some national parks etc.. But it's hit or miss. Same with a work permit. It works sometimes. Also you can sometimes use t as an ID, but it actually says directly on the card that it is not an officially accepted form of ID as it lacks the chip.