How much would a Japanese Zapdos in PSA 10 with the entire holo bleeding throughout the card he worth? I know it’s hard to determine such a niche thing but perhaps there are sales of similar cards that can contribute to an estimation?
Also, would it ever be possible for PSA to add a sub grade for holo bleed errors?
Holo bleeds are just less ink applied over the base layer afaik. I highly doubt they would differentiate due to varying levels, think of it as a grey stamp. Value would most likely be similar to a regular japanese PSA 10 Zapdos, around $60-80. MAYBE a niche collector would pay more, its very hard to say.