I have this stupid goal going on in my mind all the time when it comes to mentalism effects-"How can I use fewer "things'". I have always looked at the effects that use nothing as so much more powerful, but thats not entirely true. As others have said, with mentalism it is all about the presentation. When I first got into it, it was always a big let down to discover the method was so simple or seemed that it wouldn't work, but I learned that the presentation is what makes it hard-hitting.
The best tool for mentalism is your words and actions, not your props.