Do you tip your game processor

Just like the title asks, do you tip your game processor and if so how much?
10, 15, 20% tip? It is a service after all and gratuity can go a long way. Just curious as to everyone's individual experiences.
Process my own except for hanging time and the hamburger just easier because the butcher already has the renderings I like to add to the burger meat and I pay the advertised rate only.
 
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