I think the internet has a massive part to play in the growth of PRS sales too.
Of course guitars like the 594 and the Silver Sky have also contributed to growth. Both getting rave reviews and a lot of publicity as well as the backing of one of the biggest stars in the Guitar world in John Mayer. People were wanting to hate the Silver Sky but once they actually get to try, their prejudice is wiped away. The internet though, not just the amount of information and video's highlighting the lack of quality of their competitors but also the fact that PRS guitars are a brand that people can buy online without the worry of issues or missing out on finding 'the one', not a brand you really need to go to a store to try out first.
AMEN - At least to me, this is a big differentiator! I am just about ready to pull the plug on a Silver Sky and I already have 2 Strats