2. Starting a new job is a great skill to learn and develop.
This. I can confirm that it's a skill, based on my recent job-hunting experience. Even relatively few hours of training and practice will set you apart from the vast majority of applicants.
Edit: And I can recommend Ramit Sethi's material, in particular. The guy does his experimental research.
1. Guilt and inertia are tools that companies exploit to compress the wage of loyal employees.
2. Starting a new job is a great skill to learn and develop.
3. When I left my last job, the managers were the nicest to me they had ever been. If other employees see you mistreated then it will tank moral.