Namely, the most that you've ever paid for an ebook? (above $15, let's say)
And if you've paid a LOT for an ebook - why?
My most expensive ebook to date is
Badger by naturalist Tim Roper. It's a natural history of the Eurasian badger
Meles meles, and incorporates some fascinating recent research on badger characteristics and behaviour.
It costs a whopping (to me)
$32.85 on Amazon.com. It's also available to Britons for roughly the same amount,
£19.99 on Amazon.co.uk.
Why did I buy it? I love the British badger, it's my favourite animal, and I also love natural history