I always tip my hairdresser, brow girl, makeup artist if getting it done, massage therapist, etc. I would also give a small gift at Christmas, usually a bottle of wine or chocolates! I do the same for our delivery men at Christmas and our posties get a Christmas card and gift too. We even get one back from our postie! (A card, not gift).
I worked in a similar industry for a few years and also appreciated the clients that would tip, bring a coffee/juice, sometimes flowers or chocolates. While everyone got a good service, I would always bend over backwards for these clients as they were so appreciative. I also know how hard going it is and how much these gestures are appreciated. They’re not expected but I’d say most people tip.
also to whoever said high class, luxury salons don’t tip because there are no tip jars. Tip jars are not expected and most people would say ‘can you please make the total X’ when paying by card, the tip is then transferred to the recipient. Staff are also likely to have their own pouches/envelopes. I was at a luxury spa last year and was leaving a tip for my massage therapist on departure, the receptionist sealed the cash in an envelope and put it in her tray - I apologised for not taking the cash into the treatment room with me to give her personally but I had simply forgot and she said not to worry most people did it on departure and this was the standard process. So it is very much the norm.
For reference, I’m 30 and have always tipped, as have my parents. My dad will also tip delivery men if large/heavy items are delivered and we always offer food and drink to any worker in our home which seems to be another mumsnet controversy! It’s just the polite thing to do.