Yeah, I find that amusing. However, there are tons of hospitals seeking reiki practitioners to help them offer alternative offerings, and I'd hope you study the subject a bit more than a Wikipedia article. Here's a good one to start...
Reiki Can’t Possibly Work. So Why Does It?
Personally, I never promise anyone that it'll do anything but aid someone in relaxation and improve their mood. I know it'll do much more to help them, but I let reiki speak for itself. My procedure is figure out why they're there, and then do the thing. Before another session, I'll do a review and contrast and compare with their previous statements. What I am doing there is getting a complete rundown on them mentally, emotionally, spiritually, and physically each time I touch an individual. What I am trying to do is create a chronological picture so that changes can be monitored and evaluated. If there are drastic shifts there will certainly be discussions as to the why and so on. I don't think you're doing the job if you're not doing this. They come to you for help, and part of that is being thorough and doing your best help them sort through the particulars and support their recovery.
I've been at this for a short while and I'm rather amazed at what it accomplishes. I've seen it do wonders with addictions, mood disorders, chronic pains, and even goal achievement. It does help a great deal with diabetes but not in the way that is mentioned in that article -- most diabetes sufferers have poor diets and overeat; reiki tends to put a dent in one's desire to eat their problems away. So, in that regard I think it's helpful. I always inform diabetic patients to pay close attention to their meters and insulin intake when they get reiki for this reason. (It's easily possible that they will over-inject insulin because they're not eating so much garbage.) Of course, I am a diabetic myself so I just speak from my personal experience on that.
Placebo or not many people receive positive benefits from the practice and even from the self- practitioner angle it's worth it to do just for one's own sanity. That's the great thing about placebos though -- just because you know it is doesn't mean it doesn't work. (Not that I believe that, just that it's a silly argument that doesn't give a skeptic any ammunition. It's well documented that placebos are effective treatment in non-acute scenarios. As long as someone is able to believe they can heal, they often do... And many times that's the true problem.)
Reiki practitioners often receive calls to assist in the times where conventional medicine is failing. It might be the personal touch we give that helps, or it's some woo energy that actually exists, but for practical purposes it doesn't matter. People feel better and they're happier and that's the entire point of what we do. No reiki practitioner worth their certification is going to recommend themselves over acute care in times of crisis, but in many cases we help to alleviate various concerns that LEAD to the acute crisis. (Many many conditions are caused by stress, we're really good for dealing with that. Even doctors don't disagree in that regard.)
Traditional medicine is about 50/50 with the acceptance of reiki as a modality, but they're warming up to it. It's cheap, it usually gets the job done that it reports to do, and there is no chance at all of harming the patient/client with it. Academia is about 100% against reiki, but I realize most of their research is funded by organizations who sell expensive pills and they just gotta say what they gotta say.
I take zero pills each day at 46... I bet few here of that age or greater could say that... ZERO. I don't even take or insulin for diabetes because I don't need them. All of my vitals are good or superior and all my blood tests come back perfect. I think I'm just gonna keep doing what I do.
There is also a great YT on reiki by a man named Neil Cooper -- and he's a generous soul that actually teaches reiki 1 for free and explains it conceptually. (reiki 1 focuses on self-treatment) I'd certainly take that as a more credible source than some third party info blurb written by a random on Wikipedia.