Like most everyone else, the BP % doesn't matter to me as I take that into consideration when placing my bids. Here is the formula I use, if that helps any.
MaxBid = (MyPrice - SH) / (1 + BP%)
MaxBid is my maximum bid amount
MyPrice is the amount I plan on spending for the card (including any additional fees)
SH is the Shipping and Handling charges (if known)
BP% is the Buyers Premium Percent (as a decimal)
As an example, there is a card in a current auction I'm wanting, but I have limited myself to $1000 for this card. This fictitious auction house has an 18.5% buyers premium and a $5.00 flat rate for shipping. Now I apply these numbers to my formula:
($1000 - $5) / (1 + 0.185)
($995) / (1.185) = $839.66
So if the current bid is less than $840, then I will be placing a bid.
Hope this helps.
ChiSoxFan
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