Let's see -Hundreds of iOS games that run off Micro transactions. All those people that are 1-100 on the leaderboard have all paid tons of money to get there. -Nearly every MMO that has a special in game currency. Guild Wars 2 is an example where people could put down ~$200 for the best in game weapon by converting the special currency to the actual currency and then buying it off the market. The only method of getting the weapon would be to craft it and it can take up to months of straight gameplay. So there's that. Pay $200 for the best weapon in the game or spend months grinding for it -Battlefield 4: you got cases as you leveled up and achieved things but were usually low tier and got dupes of something you already had. So if you were too lazy to wait, you could just spend endless amounts of cash to get the best gear -Hearthstone: buy packs that had guaranteed amazing cards while if you didn't pay you had the rare chance to get one and then get shitty ones. Need I go on??