Good question ... answer is that most users, including some in Japan / China, wouldn't type in such a domain directly - they'd likely click a link to it.
The value is its graphical appearance, such as in text (Go 凸 Yourself) and links (
http://凸.com ).
Both Firefox and MSIE will not display native IDNs except for those that reside in the character set(s) the user has set their browser to (ie. English) ... hence, much of the time the punycode (ie. xn--59q.com instead of 凸.com ) will be shown in the address bar for security reasons...
In the future that's likely to change and the security relaxed and native IDNs displayed by default - IDNA2008 guidelines that bring more order and standardization along with better security (ie. IDNs of symbols, such as ♦, ♣, ♠, and punctuation are basically worthless now; 凸 is an actual language character in Chinese and Japanese and conforms to IDNA2008) is rapidly being rolled out in applications, resolvers, and registries.
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Ron