It’s problematic, because “Water” and other stuff exists. If you consider that planetary ressources are cheaper on the planets, it would still be a good deal to sell 0.38 m3 of water for 230 ISK ^^
10000 ISK can buy you a shuttle, so a shuttle in exchange for 16,5m³ of water seems a little bit ridiculous ^^
But that’s just CCP logic. In general the exchange between ISK and planetary currency is problematic.
Most people think a normal person would get 1-1000 ISK / year depending on where they come from. Maybe some people get lucky and reach even 1 million ISK, but those are probably the CEOs of companies like “Tesla”, “Amazon” and alike ^^