20k = 20,000 gp.. and it expires in 3 days
40k = 40,000 gp and it expires in 7 days
120k = 120,000 gp and it expires in 30 days
You earn gp from games when you kill people..
Use the gp to buy stuff from the item shop.
You can get new weapons etc.
The steampunk goggles doesn't do anything lol. Its just for fashion to make the character look cool.