Don't jump to the conclusion that they are not needed for a slow plane. I had to install them on my Piper Archer (yes 128 kts) I had all of my radios go silent flying IMC on two occasions. I also noticed my BFG Stormscope used to have random targets displayed prior to the wicks being installed. Fortunately the Archer has a static wick option which I installed. My issue no longer exists with the wicks installed 2100 hours later.
My guess is using your rationale, a non-jet does not need to be grounded during fueling.
I started a thread in the Comm or EFIS area regarding installing them here
http://www.vansairforce.com/communit...ad.php?t=83448
I regret not having put the hooks in place during the build process to install them. I certainly will install them.