At starting price for the Miami Nights Cozy Catchers for around 18 - 23 keys, when I got this item, it was blanc, so now I went to set a price so other people and fellow trader have a lead. So with this, I will prove the value of this item and how it should be a higher price then expected with 3 arguments: All-class, desirable effect and comparison.

Proof:

Sale 1:

$39.99 on Marketplace.tf

https://marketplace.tf/items/tf2/31250;5;u61

Sale 2: It has paint

$39.99 on Marketplace.tf

https://marketplace.tf/items/tf2/31250;5;u61

Proof 3: This item is selling for around 12 keys and its a lower unusual average by 5-17 keys for the 30 to 50 key range unusual item, so It is around 6-7 key range extra for this effect because its worth 30 keys over all

https://backpack.tf/classifieds?item=Cozy%20Catchers&quality=5&tradable=1&craftable=1&australium=-1&particle=214&killstreak_tier=0

Comparison 1:this is selling around 18 -22

https://backpack.tf/classifieds?item=Cozy%20Catchers&quality=5&tradable=1&craftable=1&australium=-1&particle=214&killstreak_tier=0

https://backpack.tf/stats/Unusual/Polar%20Bear/Tradable/Craftable/61

So this item has a good unusual and its all class. So with market place and comparing to other item like the Shutterbug,

Comparison 2:this is selling around 17 -20, Rarer item but there is more quantity and it is selling for 25 keys because painted, without 24 keys.

https://backpack.tf/stats/Unusual/Polar%20Bear/Tradable/Craftable/61

Comparison 3:this is selling around 20 keys but there is one selling on the marketplace for 50$ = 25 keys

https://marketplace.tf/items/tf2/30930;5;u61

So after investigating, we can tell that all of these prices lead around 16 keys to up to 25 keys for the same all-class unusual 30 to 45 mark. So this is my reasoning for this item around 18 -23 keys. Because while comparing to the other item around the same pruce 30 keys#, we can see it is 16 to even 22. But because this is all-class it should be even higher. And when compared to other item that is all-class and is around 45 keys, you can see it goes up too 25 and even 30+. So because it has a average of 30 keys and doesn't have a high demand. It is still all class and the effect is quite desirable while looking to other items.