I personally couldn't justify paying $5-6k for one by can potentially justify saving up and buying a kit (circa $1.5k) to convert my existing bike.
There are cheaper options at well under $2k, though they are often the folding type with smaller wheels (not sure how you'd go with one of those for long trips if the battery went bad, probably call home and fold the thing up into the boot!)
That said, some of the super lightweight road and serious off road bicycles can be just as expensive... A friend worked in a bike shops for years and the money thrown around to impress on the latte circuits was eye watering. Each to his own!
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