Mizuno, eh? Nice. The Asics have made a steady incline in price as well. I was getting them for $90 sometimes less. It looks like both brands have had similar increases. It might be as simple as runners will pay almost any price for proper shoes.
Asics Nimbus have a really good shoe for larger runners. When I pile up the miles, it wears them out.
I'm a skinny minny but have a duff right leg (from birth, made worse by years and years of driving high miles) so need decent stability trainers as I also over pronate. I'm thinking of trying New Balance next, as they don't seem to have rocketed in price as much over here.