I was wondering if there was any significant corrosion issues caused by AIWB carry. I have some anecdotal reasons why I think this might be the case, how ever if this were really an issue I would expect to see more people talking about it.
When I bought my first J frame revolver (used) the gunsmith said it was heavily corroded on the inside though the outside was flawless.
There was a story of Jim Cirrillo's where he had a small pistol that corroded from AIWB carry (Turned out to be a Nazi pistol of no small historical significance but probably not relevant to modern pistols)