I think a big factor is the price point for an American PRS which is often way above even some professional players budget and are also higher than say a US Les Paul Standard or US Strat Stanard
There is then an assumption that the SE's are just cheap budget versions in the same way that Epiphones are the cheapo Gibsons and Squire are the cheapo Fenders. However I would imagine everyone here knows just is not true at all.
I used to be a big ESP and Ibanez fan and have owned both brands of guitar but have always returned to owning a PRS (for good this time, no selling on and regretting afterwards) but when I compare the likes of ESP and Ibanez (both of whom make lovely guitars) to PRS, PRS just exude an element of class and quality that the others will never have in my opinion.
Some guitarists, especially in the metal/punk world simply don't believe that PRS are "metal" enough and want silly looking pointy sticks which in general, look fugly!!! To me at least.....
It's awesome to see super talented metal players like Emil Werstler and Dave Young embracing PRS full on.