I recognize that it's definitely possible. Unfortunately, it's also possible that all of human civilization will be wiped out by an ill-timed/placed gamma ray burst any second now. Just as you're not preparing for the .00000000001% chance of your life ending at this very moment, it's equally as unproductive to engage in implausible, unestablished, disconfirmed spiritual healing techniques.
It's true that the placebo effect derived from a false treatment can help a patient recover, but there is literally no difference from the placebo boost you get from reflexology or acupuncture and the heightening of spirits you would get from being visited by an old friend, watching one of your favorite movies, or engaging in some other mood-lifting activity. I think one of the reasons people often get confused by issues like these is that they don't understand what the extent of the Placebo Effect actually is -- it's a completely subjective, nonspecific response that is not associated with healing of any sort, just an alleviation of subjective symptoms.
The Placebo Effect does not repair your body, it simply makes your complex internal cognitive balance disregard more negative stimuli; it's basically yet another exercise in confirmation bias: I think I should be getting better, so my subconscious filters out some of the pain.
That isn't to say all spiritual healing techniques aren't worth the tradeoff however. I mean, take prayer for instance, I really doubt it works, but it takes so little effort that I would never tell a sick person not to pray or have others pray for them. It doesn't take valuable time or resources that someone who is in poor health could better use in different directions. If you want to mediate, sure, why not. If you want a massage, go for it.
I'm all about the cost-benefits analysis, but this requires a real, critical glance at what the benefits actually are. And damn near anything that you actually would have to pay for in the spiritual healing realm does not have a benefit that justifies the cost.