morning bid (was working)
Pixie's Letter - Sold to Seishuku Ryuu for 10 mil (did hit max bid)
Refine Pack - Sold to Seishuku Ryuu for 21 mil (didn't hit max bid)
afternoon bid (was active)
50m Seiishuku Ryuu - Green and Mean
20.5m Seishuku Ryuu - Refine Pack (contented with a blind bidder)
So first of all the Refine Pack in the morning auction did not hit the max bid, so the bidder didn't bit until they had a max bid of mine. Not all people is diabolical. You also have to mind that you may at anytime overstep a max bid and become the main bidder, so if you bid to troll it can backfire.
So in the second auction I've hit a max bid (number) when I made a bid of 20m. The GM informed me that that is bid of the blind bidder. So I went higher, I do not see the problem with this, otherwise normally I had to wait until a GM announced me the winner after another bid.
My alternative I had was to ask a RLF to give up some precious hours/minutes of Dota 2 for bidding in this auction. It would have been more real but still a form of representation like the blind bidder's method.