OP are you accepting this offer? I've read somewhere here in auction that newbies should send 75% of the bid to the seller for the time being until the auction closes to prove ownership of the amount he bid. And seller will refund the money after the auction if the newbie did not win. Otherwise, the deal shall continue.
I have yet to see this, but everyone are free to set their own rules for auctions here. Escrowing multiple bids from newbies at 75% would never work or be fair. Sometimes newbies will bid with no intention of following through, either ban bids from them altogether or accept a few deals will fail.