I think that event chests are actually great for non-platters. Here's why.
When people open chests, what ends up happening is a ton of plat items circulating the world server. This means that you could very likely see hundreds of thousands of idols and restos, tens of thousands of elixirs, and tens of thousands of sigil boxes gained every few weeks or so from people opening chests (just my rough estimates).
Basic supply and demand dictates that when the supply exceeds the demand of certain goods (in this case plat items), prices fall. Since people open lots and lots of chests, the average price of plat items has been going down—by a lot. This doesn't apply for the event chests themselves—the price of those remains fairly high because of the chance to get rare items.
If I remember correctly, these were the approximate plat item prices on Arawn two years ago, before the very first chests were released. Note that some of these prices may be slightly incorrect because this was so long ago, but you get the general idea.
- Idols: 200-300g each
- Restos: 250-300g each
- Backpacks/banks: non-tradable
- Sigils: non-tradable
- Super health/energy/travel/wisdom elixirs: no one bothered to buy/sell them
- Super haste elixirs: 2k each (but these were rarely ever sold)
- Super knowledge elixirs: 4-5k each
- Super combo elixirs: 8-10k each
- Idols: 50-100g each
- Restos: 100-150g each
- Backpacks/banks: 1k each or less
- Sigils: 5k each box
- Heroic health/energy/travel/wisdom elixirs: 500g each
- Heroic haste elixirs: 1.5k each
- Super knowledge elixirs: 3-4k each (depending on who you buy from and whether in bulk or not)
- Super combo elixirs: 7-8k each (same thing)
Going back to what I was saying earlier: while event chests are definitely for CH plat buyers, having them available decreases plat item prices enormously for the non-platters.
That's why I think chests are good for non-platters.
Feel free to agree/disagree, and explain if you want. To clarify, this isn't an idea/suggestion; it's just an observation. I'm not saying there should be more chests, I'm just saying the impact of chests has been beneficial for non-platters.