The prize pool for Dota 2 has reached for 10,000,000 within 30 days. This is done by Valve selling Compendiums which have numerous items within them. The lowest Compendium is $9.99 which contain numerous items such as HUD skins and courier, gameplay challenges and a chest whereas the $26.777 comes with a pet and additional treasures. You can also buy levels which increases you to earn additional Immortal items, new emoticons, loading screens, hero taunts, new ability effects, and more. Each level costing $2.49 for 5 levels, $,4.99 for 11 and $9.99 for 24 levels. Buying the compendium, you get one of each chest, but levelling the compendium up increases the number of chests you get.