The whole point of an auction is to sell an item in an easier format. This complicates things unnecessarily, and in the end you're only going to have to reverse the math for +25% to figure out how much an auction actually is. It doesn't make much sense to me. -1
All this would do would be to artificially shift prices higher in certain auctions, and in general lead to price confusion. Many people use ended auctions as price checks, this would cause them to have to do unnecessary math.
I have trouble seeing how this would work... If you ask me, it would only cause confusion, frustration, and anger. People will complain about someone buying something for less than it was really worth and will beg for rupees in the town chat. I just see this becoming a problem for the newer/ younger members who will end up losing profit. Just my 2 cents.
I remember a thirty-something to one vote a while back, haha. But I don't see how this would help/why it's needed. I can't see any actual advantages to it... (so basically I have nothing to add). Also, people would just pay more. A 100k auction would go for 25% more.