Since ours in the US is generally a percentage of the bill, people in expensive restaurants can make more. Do they work harder? Do they have fewer tables so less checks are tipping? 20% tips on 5 hundred dollar tables is $100 every 60-90 minutes, but shifts are usually only a few hours. So maybe $3-400 for a 4-5 hour dinner shift? In a diner you’d are probably half that per table but for more tables and faster turnover. What’s a good wage?
It’s just a very weird schedule and servers that I’ve known sometimes end up working 11-2 and then 6-11, or something like that, if they want the hours. They send you home when business slows down so a planned 6 hour dinner shift can switch to much less if it’s a slow night.