Cantonese cuisine is about a fresh plus original flavor, and the requirements for ingredients are more stringent.
Slightly less fresh ingredients can not do a good job of Cantonese cuisine, so the cost is high, the price is high, naturally appear upscale ah!
Moreover, Guangdong, where Cantonese cuisine originated, has a well-developed water system, rich in produce and very good natural ingredients, so the research and development of Cantonese cuisine is also more developed.