You are correct. The only hard and fast rule on gratuities and electrolysis is that you will need to carefully and politly discuss it with your electrologist. You will also need to understand that while most will simply tell you their stand on the subject, (mine is that I would not dishonor a birthday present by refusing to accept it, and you don't have to give me one of those come October 7th either, but I still have room in my closet for more number 7 sports jerseys if you want to get me one
) and some electrologists actually get offended that any one WANTS to tip them, because they associate tipping with "menial jobs" like waitressing.
I do find that for many people, the option of treating the electrologist to a meal is popular, however, for a busy electrologist like myself, it is not frequently practical unless the person is bringing something into the office, and I get to eat it prior to their appointment, which is not practical either for anything other than a light snack. Luckily, many electrologists do have the time to visit an eatery with you and relax.
Just read the previous post-string provided in the link, and maybe add your own take on the subject to that string. I do want the electrologists to understand why clients want to do this, and just how the client comes up with how much they wish to give. It can go a long way to settling everyone's stomach on this issue even if it doesn't settle the issue of should you tip YOUR SPECIFIC electrologist. It will provide you with all the tools to get that question answered between the two of you.
All we need is respect and understanding.