RE: Stay at Home Gig Mom
In the UK and Australia we use tips as a thank you for especially good service. It's basically a gift of a small amount of extra money on top of the required costs, but we don't often give tips and they aren't expected. In the US it seems to have become almost a requirement to tip, because many people working in serving jobs don't earn a living wage from the pay, so tips make up for a lot of their income. Judging by the screenshot, though, it seems tips are actually the main part of the pay.