Maybe you should do one on other professions. How often do they get checked?
I get checked 4 times a year. Every company I've worked for has had check captains with high standards. This includes ****box turbine charter companies that make low cost carriers look like caviar and champange outfits. I think you might be drawing a long bow in trying to link low cost carriers to check standards. Check Captains know that if they pass someone that then crashes an airplane that they will be called upon.
What you might find is that resources for training are less but I might be wrong. Or it could be that the LCC's are harsher during checks due to their unwillingness to spend on extra training....? Don't know.