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That's kind of true, but it isn't the right comparison. The gear hub isn't just a replacement for the derailleur, but also all your gears, and has a simpler axle. The IGH is still a bit more expensive (~$200 vs $80 for a not completely bottom of the line derailleur based system), but it also requires a lot less maintenance to keep working well.

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Getting rid of the external gears also allows you to use a fixed chain guard. Less pants with a hole chewed in one leg = profit.

You can even use a completely enclosed chain guard. You see them quite often in the Netherlands and will keep your chain out of the rain and dust, this lowers maintenance cost and lifetime significantly.

The only problem is, is that this kind of guard typically is quite susceptible to damage if the bike falls or when you hit something.

Otherwise it is in many ways superior to a belt. Belts are inherently inefficient compared to chains.

Why are belts inherently inefficient compared to a chain?

Belts have slightly higher friction. Although I'd argue that the convenience is worth the loss in efficiency for most non-competitive cyclists.

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