Throttle body spacer give gains?? dyno #'s

I bought an intake spacer (which I know is different) but I wouldn't pay $5 for that thing. Atleast Steeda makes an intake spacer so I half believed it mighta done something. I've never heard of a tb spacer.
 
ive already seen magazines that had dynos of the throttle body spacers and various vehicles lost 3-5 rwhp ...they say it actually restricts air flow..or it just doesnt work...i know there was a shop that tried to sell me one everytime i visited, but one day i told them that i will get it, but only if they give it to me and let me dyno before and after and if i recieved a gain then i would pay...well they told me no which means they know good and well that it is only good as a paperweight