IDN are tough to sell because they're not really used. Even in China people don't use IDN characters for domains, instead they use pinyin (the canonical romanization of han-characters) because you don't have to change keyboard settings.
I think the same is true in Inida. Let's take the word सर्वशक्ति (sarvashakti), if you search for "सर्वशक्ति" on DotDB you get zero results, while "sarvashakti" you get 16 results.
So I would guess that it's worthless. But I also have no experience at all with Hindi IDN:s.
Although I'd love to hear an expert's opinion on this.