The people who are in the habit of not checking NOTAMs (or even ERSA) eventually ‘throw themselves into’ the CASA ‘fishing boat’.
For example, I’m aware of an aerodrome the sealed runway of which is occasionally used for car rallies/trials/competitions. The sealed runway is, of course, NOTAMed unavailable.
The people who announce joining a circuit leg for that runway have probably not checked NOTAMs. No real harm done – although the organisers monitoring the CTAF get a bit tense - unless…
Old mate just continues the circuit (and presumably marvels at all the vehicles and people scattering off the runway when he’s on short final). The organisers of the event get a bit tetchy about that, especially when they’ve been yelling “the runway’s closed” on the CTAF.
Then there are the people who don’t check ERSA to confirm things like the circuit direction. Set up a comfy chair with a good view near the fuel bowser, grab a snack and watch those folks identify themselves then taxi to your doorstep.