We do not determine the price. The market does. The price of the DWD token (just like any other token on Steem Engine) will rise and fall due to demand. You may sell your tokens on Steem Engine or transfer them to Drugwars game and use them to buy upgrades of building and purchase units. If you need help with that, please read our detailed step-by-step tutorial.
Feel free to contact me if you have any more questions.