Double Extension Decrease Value?

[SiteBuyer]

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[dongan]

that depends on the primary domain.

for example org.uk varies from org.sg

 

[Coopey]

I bet most .co.uk are worth more then the equivalent .tl

Also real extensions (ccTLDs) are vastly more valuable than fakes i.e. a .co.uk is more valuable than a .uk.com.