Many thanks. Despite the apparent confusion, your replies have been super-helpful, as have all the others.
The 70k thing is exactly as I understood it - I put 70k into a business venture that is with an Emirati and that qualifies me for the investor visa.
My son also thinks that if I go for a residents visa by buying a property off-plan, the visa is not granted until the property is paid for in full. Is this true??