I happened to look at some "expert predictions" over the season and notice, as usual, their performance "ATS" is pretty unremarkable, about what a random duck would manage. These are the 'experts' of course who get paid to write these things.
I'd guess anyone who could consistently beat the line keeps that secret and doesn't write, he just bets. Some of the lines look enticing, like TCU at Baylor, but I notice often those slim lines are for a reason. Duh.