Never played roblox here, what the forget is a ticket and why is their removal relevant
Tickets: The mainline currency for non-Builders Club members, you could get 10 every time you log in daily and 1 (or something) every time someone visits your game (once per day, I assume) and they were in ROBLOX from the very beginning (i think) and their color was yellow and they had their own sprite for it. (very nostalgic, imo)
You were able to trade tickets for ROBUX to purchase stuff in ROBLOX, such as virtual items or services. (It used to be 1 ROBUX per 10 tickets but that got inflated over time) It was sort of like a prize system, if you look at it some way. (you build something nice, people constantly come to visit, you get more tickets, which leads to more ROBUX, and vice versa)
With their removal, there is basically no loving way (at the moment) to actually get
ANYTHING because you'd have to pay actual money to get virtual currency to buy virtual items for your avatar and/or other services.
It sucks.