Glasspilot,
First of all, the decision of the amount of the required fuel uplift is made by the dispatcher at NJA. The PIC may discuss additional uplift with the dispatcher; however, it is a joint responsibility. Should we share the points with the dispatcher?!
Secondly, please remember that the crew as a whole makes or breaks the operation. Neither the PIC, nor, the SIC is allowed to operate the aircraft by her/himself!
Therefore and in case an owner decides that the operation and the service rendered is worthy of an additional tip, said tip should go to the whole crew. Afterall, the whole crew ensured the safe and successful completion of the flight.
Thirdly, please keep in mind that under the NJA CBA all pilots are entitled equally to loyalty benefits. Nowhere does it mention that the PIC is entitled to more or less benefits then the SIC. It is purely the result of the logistics in place at NJA that the PIC ends up administrating the fuel payment process and therefore the royalty benefits. It is a fairly common occurrence in my experience in which the SIC ends up doing said task instead.
IDEtoNJA