My opinion is that generally "tricks" might seem to give short term gains, but dishonesty, in the long run, isn't a great foundation to be building on.
You can be mysterious without making stuff up. You can leave things unsaid that you might otherwise say. But imagainary friends and such, well, I just don't think so.
I'm sure some people have wonderful imaginary friends, who have been quite helpful. But it's not the way I would go.
In the end you don't "make them jealous", they make themselves jealous!
