I have an idea to create an Advent Calendar specially for cryptocurrencies enthusiasts. I suppose it should looks like usual calendar (box) that contains 24 gifts like coupons for miners, some special conditions to try new services, free tokens, discounts for icos etc.
If you are going to tie it to religion (Advent) I don't think you'll do too well.... interest in crypto and belief in sky fairies usually don't go together. The mass increase of religious people on this forum in the last year are tied to signature campaigns, and those people won't spend their money on anything crypto related.
Also, how would you issue cryptocurrencies in the calendar without you knowing the private key? Could be an expensive set up cost, which would increase your min sell break even number.
I don't really see an advent calendar as directly tied to religion as it used to be, non-religious people would probably buy them as well.
It's just a fun gimmick to count the days till Christmas, which also has religious connotations.
Most of the advent calendars here (Belgium) have pictures of snow-men and Christmas trees.
You're right about including crypto without knowing the private key, I don't see how you could do that without knowing the private key yourself.
Now that I think a bit more about it, it's probably going to be very difficult to get to a decent price point.
You don't have too many
cheap options for presents, especially if they all have to be crypto related.
If you really think that the word 'advent' will cause people to ignore such a product, call it a Christmas Countdown Calendar. Might not want to abbreviate that to CCC, that has a whole other range of possible connotations
Edit: I see that you're planning to sell them through pre-order, I would advise against that. That would definitely make me not want to buy it, just way too risky.