I thought the ruling we got for that was that you had to be a little supernatural to get supernatural stuff, and/or that supernatural people could get more out of it.I thought there were quite a few Merits we could grant that confer varying degrees of supernatural power/ability?
Like a life extension wish making a wizard outright ageless but being way less effective on a vanilla mortal where it works at all. Though I could be misremembering that.
Assuming I'm roughly correct, I think the real benefit would be giving them buffs that aren't explicitly about supernatural power. Like legendary attributes or iron will (which gives 3 extra dice to resist manipulation and the ability to shake off vampiric mind control with one temp willpower).
Being like Murphy is still impressive, even if it doesn't stack up to being a wizard. If they're willing to pass up being human three wishes isn't a bad deal. Slower than becoming fomori, but also less painful and with fewer drawbacks.
Or we make it a goal to shape our behavior so as not to be alarming.We are at a point, where we are starting to unintentionally roll legendary successes. Until we develop some charm that lets us limit our successes (something with a mechanic of "set the maximum amount of successes, if you exceed them, the excess goes into bank / burns away / gives you essence / produce some other effect") so we can safely interact with mortals without changing their whole view on life with casual jokes, we need to have someone around that'll be able to tell us "Molly, you are causing SAN damage. Stop it".
Successes go towards what you're trying to do, and Molly isn't yet moderating that. If he goal is "(verbally) cut down scrub" she should get different results than she would for "(verbally) cut down scrub without seeming unusual or causing lasting harm".