I do it all the time with my regular providers. They appreciate it a lot. Just don’t do it with the expectation that you will receive special perks or enhanced service on the spot and you won’t be disappointed. Do it because you want to ... and realize the ladies will remember your kindness in their own ways, which are truly YMMV.
Sometimes, however, it leads to special memories. For example, one of my ATF’s was having a slow day a few weeks back (Easter weekend) and texted to ask if I had time to come over and give HER a massage. Talk about a surprise. I had some free time and did it for her .... having zero expectations of receiving anything other a hug, perhaps a kiss and a thank you. Got that, and since business was so slow, we then sat around and talked about life for a while. Had a great conversation and learned so much about her. Gave me a new appreciation of her as a person too.