Since my circumstances oblige me to track my expenditures... to count my pennies... I have break-out statistics with regard to the cost of my reading. Over a ninety-day period I have downloaded 22 Kindle books at a cost of EUR 55, or EUR 2.50 per title.
How fortunate I am to read mainly English-language titles! The infographic above shows that German ebooks are on average more than twice as expensive, largely on account of the inhibiting 'fixed book price law'.