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It goes way beyond the cost of the hydrogen from electrolysis, or even from steam reformed natural gas. It is very high priced - $10-15 / KG which is equivalent to a gallon of gas in terms of energy.
It is the cost of building the filling stations and the infrastructure to supply them. They cost about $2 Million each, and they can fill about 15 cars per day.
In the area around LA, which is where most of the hydrogen filling stations in the US are - they have had a LOT of problems with supply, and very often, they can only fill cars to about 5,000PSI. Which is about half the usual pressure - so you only get about half the range.
Since there are only stations in a limited area, you can only drive (less than) half of the range away, so you can make it back.
South Korea is also struggling to get FCEVs rolling. Who wants to buy a car than you can't drive? Who wants to build filling stations, when there are so few cars? Which side of the equation has to go first, so to speak?
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