Selling Stars with a certificate has been around in Australia for about 30 years!
Maybe longer overseas.
It was even on Current Affair about 10 years ago. (they thought it was a great idea

)
Keep up people.
I was asked about it by a local, and checked on how popular it has become. Yes, there are more organisations selling stars now and NO, they are not linked to each other to prevent double-selling. It's just a legal scam. Some have Stars available for as low as $100 (no Certificate) $130 (with Certificate). Still too dear!
As far as remembering a deceased love-one, I think it is a good idea if the whole idea was re-worded to make it that. A Rememberance Star! Not 'own' it, just use it.