steemmonsters uses it for tournaments
No, only the DEC used to purchase packs is used that way.
The cost of each pack in DEC will still be $2 based on the current market price of DEC, just like when purchasing with any other cryptocurrency. It's important to note that DEC used to purchase Beta packs will not be burnt like it is for other in-game DEC purchases, but instead will go to Splinterlands as revenue for the business. We intend to put this DEC back into tournament prizes and/or save it to use for other promotional purposes. We never sell DEC either directly or through the markets.
I thought "ingame purchases" included buying cards through their market, but I guess it doesn't, then. Thanks for clearing it up.