Believe it or not, there are other motivating factors for doing good work than money. Just because I'm fairly compensated doesn't mean I'm going to tolerate major inconveniences that impede my ability to work efficiently, productively, and with a positive attitude. Part of why I want to do my job well is because I find the work itself gratifying. Once that motivating factor vanishes, I'm going to complain or look elsewhere for work. It's in both parties' best interest for complaints to happen, to be heard, and to be addressed, so that workers can get back to being both content for themselves and productive for the company.