The Hardest Naturally Occurring Substance on Earth

Not sure that make a lot of styli out of wurtzite boron nitride.🗼
If they did, I bet they would cost more than six dollars...
It's no nuclear pasta, but that stuff would be too hot a commodity.

If you look at the different tips, most are NOT as sharp as you think.
The very tip is dulled just slightly and the convex, concave tapers from the tips are actually what ride the hi/low rigged of either side of,
"The Grove"

By definition in the machinist world, a keystone lan (wider at the top, narrower at the bottom) vary greatly from almost parallel walls, to the aforementioned keystone style grove or lan.

The bottoms vary greatly also. Flat, convex, or concave, but it still has to shift left to right, AND the very tip, HAS to stay on the bottom. Mechanically that’s what is going on...Sharper, higher definition, is produced by thinner, sharper surfaces on a stylus, to the point, of abnormal wear.. Then it starts carving or shaving, the 2 sides of vinyl surfaces. One is ok to wear, one in NOT...

So a lot more than just the tip is in actual contact with the LPs 3 surfaces and all of the contact surfaces on the stylus.

Regards

I am sure my post is fleeting, but I could not resist, the POTUS brain...

In that thread there are many folks who decide which turntable to play the LP on based on the condition of the LP. Poorer quality LPs are played on more affordable turntables and cartridges.

All styli eventually wear out.

It's not so much that I'm worried that a worn record is going to wear out the stylus faster.

I'd rather use the less expensive cartridge if the record isn't going to sound the best and use the better cartridge on better quality vinyl. Yes, I'd like to make the better cartridge last longer. 

Does that "compute"?

"Not sure that make a lot of styli out of wurtzite boron nitride."

I see a business opportunity right there. The market is hungry for new giant slayer in audio. Beeswax fuses, liquid cables, Rhodium outlets, graphene, time to go bye bye. We present the new star of audio world...