If you work in such a business, you may have to accept added responsibilities in order to get a raise or improve your productivity to justify the extra bucks. Don't worry about hurting anyone's feelings. After a decade of downsizing, loyalty between workers and employers is becoming an increasingly quaint notion, and discrimination against job hoppers is waning. That doesn't mean you should wave another job offer in your boss's face unless you're prepared to leave. And it may be that even if you can earn more money elsewhere, you're better off staying.
Many workers give up more pension benefits than they realize, for example, by changing jobs.
But it's also worth considering the opportunity cost you may be paying by keeping yourself off the market.