I've never tipped anyone in my life. Tipping isn't a big thing in Australian culture since we actually pay our waiters a proper wage where they don't need to rely on tips to make up most of their paycheck.
Maybe I'm just naive in saying this because I've never been exposed to it and I don't understand the proper reasoning, but to people saying "if you can't afford to tip then you can't afford to be eating at a restaurant" to me that's the same as saying if you can't afford to pay your staff properly you shouldn't be running a business. I mean, I don't get why the US seem to rely on tips, so many other jobs have people serving and helping others, yet they don't have to rely on tips, so I don't get why it's only in food related industries where they have to rely on tips? Checkout people, receptionists, and even people in repairs go out of their way to give people good service, yet they rarely get tipped because tipping culture is so immersed in food related industries. It doesn't make any sense to me and just seems really dumb that they have to rely on tips to get their proper wage.