[ANN] Spells of Genesis - Innovating the Game Economy with BitCrystals (BCY)

In OP header post in-game purchases will result in this behavior "EverdreamSoft will buy back 50% of its value
in BitCrystals from backers (anyone who owns BitCrystals) "

Can anyone elaborate on how "anyone" actually works. I own bitcrystals, does this mean there is a market buy on an exchange, how will this work?

In the OP https://bitcointalk.org/index.php?topic=957797.0 there is a schematic "A" which I think you are referring to. So the player buys $10 worth of a card pack, of which $3 go to Apple (or Google Playstore presumably) and the other $7 go to EDS. EDS in turn uses half of that, $3.50, to buy BITCRYSTALS from the open market which they then send to be burned in exchange for the card pack they then send to the player. So open market would imply, they go to an exchange or shapeshift and post a buy order for Bitcrystals presumably after having turned the cash into bitcoin first on some bitcoin exchange or by using a service like glidera, or they offer $3.50 worth of BTC or other counterparty tokens like XCP for sale on a swapbot in exchange for Bitcrystals. Swapbots have the advantage of being able to peg the price you offer to a fixed USD value. Anyone who has Bitcrystals they want to sell can do so using the aforementioned EDS swapbot. I think the latter is more likely to be implemented in the end but someone like @hnin would be better able to answer that question. I assume EDS would continually run such a swapbot with an attractive exchange rate to always have enough Bitcrystals on hand in order to be able to dispense the card packs quickly without delay.

There was 15 millions BitCrystals (30% of all) reserved for development. And half of all BitCrystals spend for buying cards (So far that was around 1.8 millions) also gathers somewhere. Not to mention what will happen with 15 millions reserved for Awareness and Promotions. So EverdreamSoft will always or for really long time have lots of BitCrystals always ready for those that will want to buy cards without BitCrystals..

Heunland explained it pretty well (thanks!).
Just to complete: every month we burn BitCrystals worth of 50% of our revenue (no matter which currency we recieved, the amount to be burnt is then calculated in BCY, according to the rate at the moment of the burn).
As the cards are sold for BitCrystals, we receive back, by small amounts, those sold during the Token Sale (or later, via our swapbot). As long as we keep generate the most of our incomes in BCY, we will have enough of them to burn. If the most of it comes from the purchases via stores (therefore in USD or other fiat currency), we will need to buy BitCrystals to burn them.
In the two cases, the total supply of BCY will keep decreasing.

Market: yes, there's a BitCrystals market, they can be both sold or bought for example on DEX or Poloniex, or bought from our BitCrystals swapbot (where we re-sale the other 50% of our monthly incomes, which represent our actual revenue).

Promotion&Development BitCrystals: no, we're not gonna burn them, we may need them at any moment.