Thank you for the comments.
Bilbous: I can't say what the bids we have so far are, but I will say that any 'reserve' that Jirosh may have had has been met. Only the guild's highest bid will be taken if more than one price is named. Jirosh's intentions are this: Bid seriously, or go home. If you read the notice, you will see he wants a future business partnership with the guild that moves in. In an RP sense, that may be worth more than the guildhouse itself.
Parello: No bids can be seen by any other bidder, and the final price will not be announced (that is up tot he winning guild to say, if they wish), so it is completely blind. Perhaps he is taking a gamble, but it is worth a shot.

Sangwa: Setting an initial price changes the mindset of the bidders in a way. I considered it, but wanted to try this way first. If another is done in a similar fashion, a low price may be set. The lag and timezone issues are one reason this one is being tried this way.
In the RP value, I think people are overlooking the fact that you have time to toy with the minds of other guilds. But yes, those are a few of the reasons. Using Jirosh as the seller gives the ability to put RP over tria in this test. Plus, as stated above, the guild that buys this guildhouse -may- have special inside info on future Mikana Trading Co. business opportunities and perhaps events revolving around such.