I had an IT job where I was the only person taking care of all office technology for 22 locations. This got bigger over time and I pushed management to get me some help. I got some halftime assistants, one of which was great, but he was a young guy and decided to move on after about 2 years (I was rather pleased this was the longest he had ever held a job!)
Then the powers that be decided I needed a manager, and hired some old wreck retired from IBM. I have no idea why. Old? Male? Wore a suit and would be more presentable to the board than me (not hard)? It was certainly not for his knowledge. He couldn't fix a PC, diagnose Windows problems, or use a Unix command line, and actually added to my workload because he would break his computer and need me to fix it. A co-worker quietly told me he spent his day playing Solitaire and taking messages because he was unable to solve problems.
He didn't seem to want to learn, either. That was the kicker. I would usually spend an hour a day teaching my previous assistant about networks or software, but this guy, his ignorance was just too big and he just didn't express any curiosity. I'm pretty sure his job was to collect a paycheck.
I quit. There wasn't really much choice. I was overworked and insulted. And within 2 weeks he resigned as well.