Not to be missed for lovers of dragons

My 8 year old daughter is crazy. The illustrations are beautiful. It is a series that appeals to the whole family from 8 to 99 years. Texts very well written and rich new vocabulary without comprehension problem for children. But, against what is a financial investment: 6 euros per 20 volumes .... The idea would be to increase the number of chapters by volume to reduce the purchase cost of the series but then miss the superb illustration some blankets :(