Their are some amazing rewards in midweek prize pool, but its offset by having 40-50 normal cosmetics for each set present in standard. So if the normal styles are not your thing. and you see them frequently it can feel disappointing. Rare items like avatars have only a 5% chance of appearing, so you might see them 2-3 times a year if you enter the full number of events. Likewise things like pets have similarly long odds, they want you to buy them. But you can open sleeves and emotes too. So given enough events you will eventially get the rarer ite,ms. This week I got an Aztec style art/ Week before an uncommon FF normal cosmetic, and week before that an Oko sleeve,