I tip my barista and budtender a dollar every visit, personally. I love those people though. Restaurants get 20% unless they fuck up, then it's 15%, unless it was absolutely egregious.

That's it. I cut my own hair.

IMO restaurant tips (and other service businesses) are 15% by default, 20% if they do well, 10% if they do poorly. If they do especially poorly (like, completely ignoring the table for an hour while chatting with coworkers off to the side), they get $.02. If they do especially well, more than 20% (I've gone as high as 50% once).

I also cut my own hair, but sometimes I’m lazy and just hit up the Barber shop.

She charges me $15! I tip +$25 and it’s still a cheap haircut.

My haircut has to be one of the simplest around, but 9 out of 10 stylists will leave me fixing it myself later. Once I paid $50+tip for the same cut at a swanky joint and STILL went home and fixed it. She doesn’t know what she’s worth.

My barber earns his fat tip taming my unruly cowlicks. Barista and bartender? Definitely. Cashier at a convenience store? Oh hell no.

My barber earns his fat tip by being my therapist.

I get it. That's worth the compensation.

Have you taken into account that tips are no longer taxed and adjusted these arbitrary percentages?