<i>Also, considering probably the vast majority of servicing of iPhones happens at an Apple genius bar</i><p>That may not be the case for display replacements.  From what I&#x27;ve seen, the Geniuses won&#x27;t attempt to replace a screen if the phone&#x27;s chassis is even slightly deformed.  But the local fixit shops will.<p>The question then becomes, &quot;How random is the subset of people who get thrown out of the Genius Bar for screwing up their phone really badly?&quot;  The wealthiest of those will just buy a new phone, so that&#x27;s one potential source of bias, I suppose.