Some people are just simply not cut out for this line or work, no matter how hard or how often they try. It doesn't say anything bad about them, just that they're barking up the wrong career tree is all. Unfortunately, some refuse to see or accept that and just keep on trying and trying until they don't have a choice but to look into something else for which they are more suited.
"Now I can just tell people that I'm old, cranky and to leave me the hell alone!" --retdetsgt
"I'm a certified Bovine Scatology Detector" --Creeker