High gold value

500g+ are rare indeed, needs high level foe,

Is it from NF treasure? 500-600g golds happen most from those and can drop up to 680g

502 tells me it is inscribable, gold rarity, has a increased sale value inscription, the version you have adds 74g, the base item (if you'd remove the inscription or replace it by another inscription) has a value of 428g, which then tells me it was 54g unid or higher, which is possible on any lvl20+ mob, just a bit unlikely.

so in summary: items with very high value are somewhat rare but do not bear any significant value - different story for base value above 488g, because then it can not happen on mobs. also clean value 500, 600 and 700g items will in fact have an audience, but even then it is not so valueable.