Buying all TF2 related items, except keys!
Refined Metal - 2fg each
Frying Pan - 3fg each
Ellis Cap and other random craft hats - 3fg each
Secret Saxton - 4fg each
Backpack Expander - 85fg each
Tour of Duty Ticket - 85fg each
Unlocked Cosmetic crates - 150fg+
Taunts, crates, cases, paints, tools, strange, promo, vintage, genuine, and random inventories!
However I'm not really keen on buying the following: Low crafts, spelled stuff, items with valuable strange parts or painted stuff.