TL;DR: Event loot requires enormous amounts of time and/or money to accumulate. We should know ahead of time what is available to spend loot on, especially since we have a restrictive time window to gain tokens.

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https://nexus.leagueoflegends.com/en-us/2019/10/ask-riot-worlds-tokens-meta/ (This was posted a week after the event started)

Are there going to be more things you can get with Worlds tokens?

Yes! We’ll be adding more things you can spend your Worlds tokens on throughout the course of the event, including a Prestige skin for Qiyana.

We knew Prestige Qiyana would be event based, but it really should have been announced before the event started that it would be the Worlds event.

More items will be added throughout the event, so be sure to check the in-game shop before the event ends.

That is insufficient information. Two token-based Prestige skins in one event is setting a new precedent. Presumably that's going to be another 2,000 token loot option. Those of us not willing to splurge on multiple bundles for extra tokens are planning our token grinds to reach certain goals, and having this sprung on us a week into the event changes those goals.

For example, someone may have wanted to get the following loot:

• Prestige Valiant Sword Riven: 2,000
• Majestic Empress Morgana Chroma & Icon: 300
• Majestic Empress Morgana Border & Icon: 250
• Championship Ashe Chroma & Icon: 300
• Championship Ryze Chroma & Icon: 300
• Championship Ryze Border & Icon: 250
• High Noon Ashe Chroma & Icon: 300

That's a total of 3,700 tokens.

The event is roughly 55 days long. Assuming players are not screwing with their sleep cycles or work, school, and family duties to reset their First Win of the Day timers earlier every day to eke out a few extra FWotD, that's 990 (55 x 18) FWotD tokens. 400 tokens are available via free missions. 200 tokens come with the Worlds Pass.

3,700 - 990 - 400 - 200 = 2,110 tokens left to earn via grinding unless you spend more RP on bundles.

2,110 / 55 = 38.363636... average daily tokens to meet that target.

Depending on your preferred game mode, the number of games needed varies:

• SR expected value with 50/50 win rate: 9 tokens
  • ~4.2623 average daily games
• ARAM expected value with 50/50 win rate: 6 tokens
  • ~6.394 average daily games
• TFT expected value with 50/50 win rate: 7 tokens
  • ~5.481 average daily games
• TFT expected value with forfeit at first chance: 4 tokens
  • ~9.591 average daily games

Finding out that Qiyana's Prestige skin is a Worlds Token purchase with 48 days left means that players have 3 options:

• Alter their gaming schedule to add ~41.667 (2,000 / 48) tokens to their daily grind
  • SR games with 50/50 win rate:
    • Additional: ~4.630
    • New daily average: ~8.892
  • ARAM games with 50/50 win rate:
    • Additional: ~6.944
    • New daily average: ~13.338
  • TFT games with 50/50 win rate:
    • Additional: ~5.952
    • New daily average: ~11.433
  • TFT games with forfeit at first chance:
    • Additional: ~10.417
    • New daily average: ~20.008
• Give up on some of their loot choices (and in many cases, this means choosing Riven or Qiyana)
• Burn more money/RP on bundles for more tokens

Is it really so difficult to give us a concrete event loot schedule at the outset? It really would be considerate.