Well, I'm just doing what I think that is fair.
The auction rules on Ultima are somehow flawed. People are allowed to retreat offers after almost doubling the offer. I tried to be fair to everyone and return the offer to the 330 PDs. I could just consider the last offer of Garland and say the CHB was 500 PDs. The countdown timer was breaking everytime I tried to edit first post with rules, etc. I think that auction was interesting, it was a lesson of what shouldn't happen in an auction.
And if you know well the math, you know that for someone that is aiming to sphere weapons:
15 DTs adds 35% of attributes
99+20 PDs adds :30+5% of attributes=35% attributes. I rounded it to 120.
So 15 DTs:120 PDs is equal to 1:8, which is the ratio I was using since the start of auction. Doesn't matter if it was PDs or DTs.
Now CHB is 528 PDs and the new offer (2 minutes before auction ended) is 535 (7+ PDs than the previous), I think it is unfair to consider it as CHB.
That said, I'm closing this topic to avoid possible drama.