I'm sorry you didn't mention what the benefit structure is at your company. Erin took a job on the Q.T. while still on your boss's payroll. In the state where I live (California), that would be a reason to fire her. I do not regard enlightening your boss about what Erin did as deceitful. I think what you did was the right thing to do and loyal to the company.
Company loyalty programs are actually costing you a lot of money. That's because shoppers who stick with their favorite brands just aren't being rewarded the way they used to be. She called customer loyalty "a sham." Airlines, internet providers, and banks do a good job of luring in newcomers with flashy deals, while longtime customers quietly pay more. As a result, frequent flyer miles buy less, internet bills creep up after promo rates, and credit card rewards shrink in value.
Stankey acknowledges a shift away from traditional employment expectations, stating, 'Some of you may have started your tour with this company expecting an 'employment deal' rooted in loyalty. We have consciously shifted away from some of these elements.' His memo actively redefines loyalty and sets clearer expectations for employees within the changing landscape of corporate relationships.