Most Helpful Girls
Caviar has to be eggs that come from Sturgeon which are being over-harvested and whose habitats are being destroyed by the over-harvesting. Therefore, the supply is lessening significantly which makes it harder to meet the demand.
It's rare, hard to catch/find and seafood is expensive.
Most Helpful Guys
Supply and demand. If you are talking about Russian caviar from sturgeon, it is only harvested in the Caspian sea from mature females, so the supply is quite limited and there's no way to farm it. It's the same for certain mushrooms like truffles and morels. There's a interesting story behind all exotic foods.
It’s rare, hence prices are high. On the flip side something like chips, there is millions of potatoes in the world, making them cheap to buy and manufacture