What’s your vote for the most ridiculous, overpriced, and useless tweak?

I vote there are no ridiculous, overpriced, and useless tweaks.

For me it was the horror of spiked loudspeaker stands. Some of these vandalising monstrosities even had spiked top plates!! Ouch!

After all the careful alignment and sitting of spikes through carpet (on crosshead screws no less) what was the improvement in sound? 

Bugger all improvement I'd say! Yet many voices, Linn amongst the loudest, were proclaiming that these items of ironmongery had to be assembled with enough pressure to almost burst blood vessels. Ditto for headshells.

Thankfully the alternative approach of a degree of loudspeaker isolation is now making a comeback.

Eventually we may even see a return back to the days when speakers used to come with small attached rubber feet.

My speakers, turntable, amp, preamp work best when spiked.  Everyone tunes to their preference.

Just wondering if we can get a little clarification- is the question what do you think (imagine, fantasize, hope) or are we talking about tweaks we've actually tried?

“What’s your vote for the most ridiculous, overpriced, and useless tweak?”

>>>>>Look at it like a Venn diagram. 🥨 The three criteria you name are mutually exclusive except in rare cases. You got your ridiculous tweaks, which may or may not be overpriced OR useless. By the same token an overpriced tweak might not (rpt not) be ridiculous OR useless. And a useless tweak might not be ridiculous OR overpriced. A ridiculous tweak could be FREE, so it could a useless tweak. There may be many tweaks meet two out of three criteria. But, gentle readers, the universe in which all three criteria are met - the center area of the Venn diagram 🥨 - is probably quite small. Maybe there should be three separate threads. 😬