I wouldn't claim guaranteed. The price only goes up while enough people believe the price should increase, and I think certainly counts as a 'greater fool' inve

I wouldn't claim guaranteed. The price only goes up while enough people believe the price should increase, and I think certainly counts as a 'greater fool' investment. On one hand, there is an entire industry propping it up. On the other hand, it is a fashion. On the third hand, it will become less useful as a store of wealth as banking and tax regulations tighten. Old cars are interesting. A 60 year old Ferrari is now worth so much because they are so rare. When they were made, those Ferrari's were a terrible investment because most of them would not be around in 60 years time.