The town of Gujo Hachiman is the centre of Japan's replica food industry
theguardian.com
theguardian.com
After awhile, you'll notice they don't vary too much one to the other. But it's still a fascinating UX. I'm used to looking up photos on Yelp and yet I still found myself looking closely at...plastic!
People are window shopping a lot of Japan for their food options, oweing to the very high walkability, density of shops esp inside department stores and airports and the like, and high overall average quality of shops where very rarely will you have a terrible experience, making people more willing to step into ships with very little prior vetting. So when your customers are window shopping, these serve to tempt and posture their interest to step foot in the store. When you see the udon bowl you might think "oh I didn't realize it until now, but I'm in the mood for udon today".
After eleven years in Japan, it works the other way around for me too; if there are no plastic samples out front, I'll just mentally dismiss restaurant and keep looking for somewhere else.
Even the restaurants that can't afford plastic samples for whatever reason will often make popular/common dishes and just saran wrap them to put them outside to show what's on the menu.
Curious, what are you interested on and how much would you pay for it including everything? (Item+transportation+fees+labour).