A friend of mine told me about something like this whereby they showed him a screen that made him think he was making money on the #10k he had deposited and so he added #15k more. The balance kept rising until he asked how to withdraw whereupon the balance began to dwindle towards nothing and the agents started to disappear.
He is a computer person who checked reviews before investing; so it is frightening that he could be taken in and ro bbed of #25k so easily.