I don't really care about whether or not people use any of the marking packs.
I use the default markings on characters they'd work best on (For example: Fire has default markings), and markings from packs for characters they also work best on (Like Naoma. No default markings match her well enough).
As for the judging on literacy based on markings... Well, that's just stupid. Who knows? Maybe a super literate player prefers the default markings over the packs? Or, a not-so-literate player uses the marking packs (Seen a lot of those, actually)? Nyeh, people can judge people all they want. Doesn't mean they're right about the player themselves.
(pfft, the correction thingy tried to correct nyeh into NEH)