BIS LISTS ARE PUBLIC AND FIXED
How it is played
Faction
Region
Loot
Server
Classic has no secondary stat lottery and no titanforging: a spec has one best-in-slot list, everybody can read it, and it has been the same list for years. That makes gearing here a question of access rather than luck, which is why it is sold by the piece as well as by the set.
Naxxramas tier is the only set in the game that cannot be farmed casually: the raid needs forty people who know it, the attunement comes first, and the drops are per boss per week. Everything about that is scheduling rather than skill, which is most of what the price covers.