I heard the word ''inflationary'', also ''inflate''. ''inflatory'' - never. But I am not a native English speaker, let's check with the one, who is
@jhm - what he'll say on this.
What I can tell is that please, do not assume if you see something written in google and not registered as a one word (''wow, I got one word domain, we all know they cost tons, right?''). Wrong. It still has to be more or less recognizable, of a certain use in a certain area (and not the one where 2 out of 1000 people knows what it is).
The way it is - I wouldn't buy it myself. But good luck, obviously!