Nothing wrong with an incentive that makes people think about how much fuel to take rather than just taking extra for the sake of it. And also maybe make people think twice about taking more fuel to get back at their airline because they’re annoyed with them. Yes it happens. And no one is going to take an unsafe amount of fuel for 1% of their salary - not worth losing 100% of it over 1%!! I’d like to think the modern airline pilot balances the operation with a sensible well thought out amount of fuel, being aware that extra fuel costs money and carbon emissions. And fuel comfort levels vary dependant on experience (total and experience of the route you’re operating) and knowledge of fuel policy. I have some months where I don’t take much extra, others I do. It mostly depends on the weather and destination.