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Why would I buy one?
A spot on a map other people already look at, a short coordinate, and a page with a guestbook. Planets start at £5.
A bio link lives wherever you paste it. This lives on a map people are already wandering around.
The coordinate is short enough to say out loud. The page has a guestbook and neighbours, so it does not feel like a blank profile.
A planet starts at £5. A system, sector, or galaxy costs more and puts a bigger label on the chart. If you want the name people see first, buy a galaxy.