Extract: "An interested buyer asked about the renewal price but the seller said that he was on his iPhone and couldn't remember. I say that it seems pretty hard to forget paying for a $4,500 premium domain just a few months back. The seller said that he thought that it was a $1k premium domain like a few others he had. The interested buyer eventually found the renewal price on his own and posted it in a comment".
Source: http://onlinedomain.com/2015/01/19/news/owners-of-high-premium-new-gtld-domains-trying-to-sell-them-by-hiding-renewal-cost/.
Domainers register their domain names with Uniregistry.