Congrats on getting married and Bitt gave the real answer.

My experience working in restaurants has been the people in the kitchen get paid the same per hour as the waitresses but they do not get tips and they do have to do just as much or more work than the waitresses. The difference being they don't have to directly deal with the customers. I never worked in anything other than family type places but the waiters/waitresses still got tips. Yeah I know how much they get paid 7.25 an hour plus tips and they never report the tips as income so they pretty much pay no income taxes.

I do tip but really all this tipping stuff is based on some kind of tradition or fear of bad service not any logic. What is the logic behind tipping a photographer and not a repairman? The photographer is probably getting paid more than the repairman and is probably setting their own price anyway.