Maybe it's a Sydney/Melbourne thing?

I definitely see a few S13 and S15 Silvias around (more so when I lived in the Dandenong area), but no matter where you look in Melbourne, there are DC2/4s absolutely everywhere, and quite a few DC5s as well. I see five DC2s for every Silvia I see on our roads, and that's a conservative estimate. I'll go days without seeing a Silvia, but I can guarantee that I'll spot one or two DCs on every trip. Then there's an abundance of EGs and EKs, too.