I think the best way to answer this question is to refer you to this blog https://benebellwen.com/2018/09/12/what-does-it-cost-to-self-publish-a-tarot-deck/
which gives a much better explanation than I can.
Basically it is down to costs and economies of scale. I can get the cost per deck down to Amazon levels if I order several thousand units and get them printed in China. However, for a niche deck like this, I am looking at an initial print run of 200. There are many printers who wont even produce a run as low as this, and have a minimum order of 500 or 1,000.
The funding I have asked for does not even cover the costs of producing 200 decks, and I will be making a loss up to a certain level of sales.
The cost of rewards for this project is similar to most other kickstarter tarot decks. I wish I could offer the rewards at a lower level, but at the volume I am dealing with it just is not possible.
The deck really is a high quality item, and the deluxe version represents very good value for money when considering the costs of the high quality components.
Thanks for reading