This is why I've started telling younger people in the industry (I'm 52) "Don't worry about giving two weeks notice or doing knowledge transfer, it's not your problem. If you accept an offer and a better offer comes in before you start, take it and don't think twice. If the better offer comes in after you started, quit and take it, and don't think twice. If you're in the middle of a critical project at work and they're depending on you when a better offer comes in, take it and walk away." Loyalty in employment relations has been dead for a long time, since before I started working, but now it seems that even basic decorum on the part of employers is dead as well, and there's no reason to allow it to be asymmetric.