Perhaps you don't notice how little the full-time people are trying :) It's not hard to try harder than them.
BTW now I'm curious. It sounds to me like you're talking about very different contracting that I am? I have never seen a larger company allow contractors to skip the agile ceremonies. They're always treated exactly as an employee in this regard - they're basically "temporary" augmentation of the staff, because company is not able to hire enough permanent people. (BTW this "permanent" state usually extends into years of staying at that company). Is this the kind of contracting you do, or do you do something else?