The appraisals are not really on the spot are they, the only valid argument was about the lack of meaning which, as it is a japanese dn, implies that the current potential in type-ins is low and so the current potential market value is relatively low but surely not reg-fee...often, single-characters are considered as to general for any purpose and there are several thousand sort-like characters so the rarity is not really an issue, not at the moment anyway. I would say that it this moment it is worth between $50 and $100, not very high but then again, the idn-market is just beginning to grow.
Do a.com ------ z.com have any meaning, NO, but they have a universal connotation with any commercial product as long as it has a latin name and they are extremely easy to enter. The question you should be asking yourself is, what are non-idn single-character domains worth and how does that translate to idn single-character domains -->what are the elements that determine the value of non-idn single-characters and how can we transpose those elements onto idn single characters and further, how do they relate in a technical, linguistical and sociological sense ?
You should at least analyse the idn-character with respect of it's language, that's the determining factor in connotation, rarity and simple practical matters such as it's possible placement on keyboards.
