Roblox removed its Tix currency in 2016 because they wanted to simplify their virtual economy and focus on their premium currency, Robux. Tix was introduced as a secondary currency in 2007 as a way for players to earn currency through various in-game activities and events, and it was often used as a way to purchase low-cost items and accessories.
However, over time, the role of Tix in the Roblox economy became less clear and it was used less frequently by players. This led to a situation where Roblox had two currencies, which made the economy more complex and difficult to manage.
By removing Tix, Roblox was able to streamline its economy and focus more on the use of Robux as its primary currency. This made it easier for players to understand and participate in the economy, and it allowed Roblox to introduce new features and functionality to support the use of Robux.
Overall, the removal of Tix was a strategic decision by Roblox to simplify their economy and better support the needs of their community. While some players may have been disappointed to see Tix go, the move ultimately helped to improve the overall Roblox experience for players and developers alike.