128 tick servers have long been a demand from the community. However, addressing the issue Valve developer has confirmed that they have no plans for bringing in 128 servers. This is due to the hardware of most of the players in the game. They would be unable to play the game if the server requirements were increased.
It's not a dumb question. We see this request often. The problem is actually that most players would actually be disadvantaged playing on 128 tick because they can't keep up. So we'd need to segment the players which would lead to longer queue times…. Still may be worth it, tho
— John McDonald (@basisspace) May 6, 2018