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They are not “generally cheaper” (ebooks are usually about 30-50% cheaper), and much less convenient if you travel a lot.

also you have to buy a device to read them on

Once.

typically on amazon you can find cheaper physical books via alternative sellers like bookdepository

Not if you are not living in the US. For a European who wants to read English books, Kindle Store is a blessing.

I'm in UK and prefer buying a book for 1p and pay £2 shipping than £11 pound for an ebook that i wont' even own, merely licence