Anyway, about that auction. I'm an academic by trade (and happen to research on... auctions), so I can tell you that all this trolling will not deter experienced, true bidders.
By "true" I mean they really want to buy it and have the money in the millions of yens, "experienced" means they are reasonable, logical people. So this would include big organizations, museums, trusts etc... -- those that probably do make up a portion of those high bidders.
There is some psychology going on in bidding, yes. But in these ascending auctions, the best strategy is to submit your bid once, and that bid is your true price (ie: the maximum of how much you want to pay). Since if you win, you only pay the price of the second bid, therefore, there is no harm in submitting your true price.
For these timed online auction, only the last day matter. True bidders won't care about it so much until the last 30 minutes. So it's probably all trolls now.