It's not a surprise because many good and hi-quality models in Mainland, esp. it costs relatively low to take photos for them! For example, shooting photos in Guangzhou with 3 models costs RMB50-150 for 3-4 hrs but it costs HK$150 for 1 model in 1 hr only! For a car show in Shenzhen, the ticket is RMB25-30 but most car models are fashion models. Can U see that in HK??