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xkcd #3126: Disclaimer
(imgs.xkcd.com)
A community for a webcomic of romance, sarcasm, math, and language.
This honestly isn't rare at all, and people who try to flaunt it as some kind of mark of erudition tend to come across as... well, not quite what you intended.
Rare in certain corners of the internet? No.
Rare in the general public? Yes, absolutely.
it's stupid that English uses Latin abbreviations for these things; my first language is German and so:
When I first saw these abbreviations in English, it took me about ten seconds to memorize that "e.g." means "z.B." and "i.e." means "d.h.". If English just did it the way German does and abbreviated its native expressions ("f.e." and "t.m."), it would be obvious to everyone which is which.