It's rare to see people who are that loyal.
In life, some things are worth more than money. Maybe he feels appreciated, cared for, and also important at the factory, you can't find that everywhere.
And just like your mum said, maybe he loves the comfort of doing the same routine.
Sometimes it still bothers me how there's a person getting a little too comfortable like that but I guess, he does love the comfort. Thanks for checking out!