Avocado trees are time consuming to grow, and when you harvest them, the whole tree must be cut down. Avocados also take around 18 months to ripen after they're harvested, and consequently many of them end up rotting in storage before they ever make it to market. Finally, avocados taste best when hand-picked from a fruit stand or farm rather than shipped in from other countries. Unfortunately these factors combine to make avocados expensive and in demand by consumers like you who like healthy food already!..