When playing ARURF, a player can buy a skin boost until the timer hits 0. In other words, a player can buy a skin boost without giving his/her team any time to react.
This is bad because the skin boost automatically switches your current skin to the skin that was unlocked by the boost. This means that people will stop you from using the skin you want, even if only on accident (Although on PBE its clearly not always an accident).
If I remember correctly, on ARAM there is a lockout timer where you cannot use a skin boost in the last 10 seconds, and I think the same mechanism would make ARURF work better!