"proven time and time again to be of absolutely no use"
I'd have to take issue with that. I'd say "proven time and time again that it may be of some help" in any lightning strike.
And for most sailboats, with a typical external lead keel, the only investment that is needed is to run a heavy cable or strap from the mast base to the keel bolts "encouraging" the strike to take that direct path down and out.
It may not protect the boat from ALL damage, but it greatly increases the odds of MINIMIZING damage from flashovers and other routes.
Three to six feet of heavy cable or busbar, a couple of good bolts, no big investment no "systems" or polyphasers needed. You don't need arc devices like that when you are not trying to protect antenna lines. On a boat, all you need to do is remember to UNPLUG the radio antenna when not in use. (And preferably ground it at the mast.) Or add the polyphaser. Not so hard to unplug and secure the cable when you leave the boat.
HelloSailor and I Obviously disagree, but you are all free to do what you feel to mitigate. I am only offering my experience (as does he), but I would point you to my complete thought....
"proven time and time again to be of absolutely no use in a direct lightning strike to the boat "
Further, you can disconnect the VHF if you like, but that does nothing to remove that highest, shortest path to ground i.e the coaxial cable - and the salon/nav, where lots of tasty electronics, direct paths to the engine/battery and such are but a MM away, and which will likely be the first boat part to throw lightning back to the sky and establish a strike path. The cable is still connected to the antenna, follows the spar direct to the interior...and it will find a place to discharge. False action 100%
If the big bussing of cables, questionable connections and such make you more comfortable, by all means do so. To be of any use, they need to be sized, installed and maintained in pristine condition with NO mechanical splices, else those will explode.
Again I would encourage you to research lightning strikes as presented by BoatUS, Panbo and NFPA, a few years back and point you to those systems designers who have all but proven that the "highest, sharpest point" that mid describes is no longer valid and has been proven such by quite a bit of research. NFPA and those designers agree that a "cage" offers far more protection than the spar being grounded to your keel, maybe as he describes it as a DIY...for some DIY pictures of what does NOT work, simply google aluminum boats and lightning, or ham radio/chimneys/lightning strike