It seems like a wild choice to give a specific figure as additional cash rather than just letting them keep their (wiped) laptop. That additional cash will be taxed (as should a laptop that is left with the ex-employee, but the used laptop can be valued and taxed as a used laptop rather than a $1500 cash payment [and frankly would often be, um, overlooked...).
It seems like it's better for Patreon (cheaper, less IT labor) and approximately as good for the ex-employee to make this be in the shape of the used laptop than a $1500 payment.