My ex mother in law is a Reiki Master and she has issues with Reiki , not because she feels it doesn't work, ( she does), but because of the ethos of having to charge people for it, ( the 'energy exchange' principle).
Therefore she is happy to practice Reiki but does so virtually free of charge.
If you want to make a fast buck then any sort of healing is really not the thing for you, as morally it's a pretty reprehensible thing to do.
I do energy work in other spheres( not Reiki) and I can guarantee that if you are simply seeking to earn money from it then you really won't raise any energy at all and it really won't work. you have to have some significant intent to work with energy, good or bad, and indifference because it's only a financial scenarion you're working in will scotch it every time, so do yourself a favour and find something more lucrative.