system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: how come lobsters became so expensive? They used to be poor man's food. 

Thankyou in advance!
gpt
Say there are 100 school kids and they all enjoy cheap cheap jello. When 4 of the kids decide they want all the jello (for whatever reason)

 - It's tasty

 - It's sexy

 - It makes them feel rich(er)

 - religious reasons. 

Supply and demand kicks in. 


They buy up all the jello and that drives up the price. 

Fun fact (1): Shark fin soup has very little taste and is mostly pork stock.  It sells for $70 because of the allure and prestige to Chinese people. 

Fun fact (2): Conspicuous consumption: The odd behaviour of why humans buy things they don't need.