I would love to see a full prototype of this marketplace in action, the amount of stuff we've been given over the years has been huge (atleast for cosmetics and weapon skins *ahem* Endless rework *ahem* VS survival rework *ahem* UI fix *ahem*.
Maybe have something that looks a little like this:
Black Market: This is a market that works alongside the vosh vault. Your money that you've earned can be spent here (The overall money you earned does not subtract from the progression you've made to earn a Dosh Crate, now essentially functioning as "XP" similarly to Halo Reach).
With the money you've racked up since the vault's creation, you can spend it on a given item filtered as listed:
Weapon Skins: Battle-Scarred at £250,000, Field Tested at £500,000 and Mint at £750,000.
Outfits: Rare Items at £250,000, Epic at £500,000, and Precious at £750,000
Headwear Cosmetic: The price scale would increase based on its rarity, and will be listed based on how much of the head-space it uses (least at the top).
Body Cosmetic: Working from the same price scale as headwear, except it is subcategorised as to where on the body it is equipped (Back, Arms, Chest).
Seasonal Tickets: A flat cost of £100,000 for one ticket, regardless of season.
Golden Tickets: A flat cost of £750,000 for one ticket, regardless of seson.
This concept can be transferred over to seasonal items, since we have so many across numerous seasons, how can't you?