This is a very interesting topic because as Tony Kern said in his book Redefining the Airmanship we always can improve our level of skill from Safety, Effectiveness, Efficiency and Precision. Fuel management is an area in which we can make the improvement. From bringing always the same amount of extra fuel regardless of the wx, traffic, destination, fuel price…to an improved fuel management. We can discuss about a lot of good practices but I just want to mention one of them which is tankering.
Tankering is an interesting method when the fuel price at departure aerodrome is considerably less than at the destination. As you said you have to calculate if it’s worth it or not (extra fuel burn per 1000 kgs, cost of heavy landing weight,…) usually for short or medium haul it is interesting. You need to be careful also about the structural limitation especially max ldg weight.
That said, tankering offers 2 big advantages: cost saving and extra fuel in case of marginal weather or traffic congestion. Your stress level will be reduced in case of unexpected delay or marginal weather condition.