Badges of Justice are TBC Classic's slowest currency: a couple per heroic, a handful per raid night. That drip rate means a wrong purchase costs you weeks — so spend like the badges are the bottleneck they are.
Universal rule: trinkets and idols first
Badge trinkets and relics routinely outlast tier pieces because trinket slots upgrade rarely. If a badge trinket is best-in-slot for your spec for the next two phases — and several are — it beats any armor piece with the same price tag.
Casters
The Icon of the Silver Crescent class of trinkets is the classic first buy, followed by badge gems only when your gear is stabilizing. Avoid spending on slots your raid's next tier drops will replace within a month — check your guild's actual clear pace, not the theoretical one.
Melee and hunters
Bloodlust Brooch equivalents first, then the notorious hard-to-fill slots: bracers, belts and rings where dungeon loot is weak. Physical DPS badge belts often survive deep into later phases.
Tanks
Stamina trinkets and the badge shield/bracer options fill genuine holes, but tanks should weigh badge gear against crafted tanking epics — sometimes the auction house solves a slot cheaper than three weeks of heroics.
Healers
Mp5-heavy badge pieces are undervalued by players chasing raw healing power; sustained mana wins progression fights. The badge healing trinkets are strong early buys.
Accumulation math
A player running three heroics a week plus Karazhan banks roughly 25-35 badges weekly — meaning a 41-badge trinket is a two-week decision and a 75-badge piece is a monthly one. If your badge income cannot keep pace with your raid's gearing curve, daily heroic carries compress the timeline dramatically: more badges per evening, no pug roulette. Spend deliberately, and the vendor becomes your most reliable loot source in the game.