I can assure you that in Australasia there is both high demand and high prices. Even in season, avocados are typically $2.50 ($1.80usd) each in NZ (and this is a crop that is widely grown locally).

It's worth noting that the 'smashed avo on toast' meme originated in Australia. It was a tongue-in-cheek jab at millennials who complain of being priced out of the property market but still have the temerity to visit cafes regularly.