Yes too many variables. Will you be using china or basic, are you plating or serving buffet? How long is the event? Will you be at a venue that requires the caterer to set up, clean up after event? We do these type of events often with full china, set up, servers, buffet, tear down and clean up for a 5-6 hour event. The price can vary but averages in the $40-$70pp range with staff, china rentals, appetizers, salad station, buffet and drink station provided we are not handling the rentals of tables, chairs, linens and more. If so and add abc service the price can be $75-$110pp. If you are simply serving a buffet with a basic backyard paper plate service then $17-$23pp for what you are serving.