Are contact treatments worth the money?

f audio (or electrical) connections did indeed provide optimal transmission: contact enhancers could not further affect one's music reproduction, but to degrade it, or have no effect on it at all

Yes, yes, but the connections are mechanical & flimsy. (Silver) "Conductive grease", which is non-fancy name for the stuff, is used for moving mechanical contacts... it helps with electrical & thermal conductivity.
OTOH, there is a risk of metal migration (silver into the gold plating of the contacts).
See fo example products like this.
I use such a product, cleaning it every 3-4 months (with acetone -- take care not to touch ANY plastic with acetone) & reapplying.
No doubt Walker's products has its unique merits except one: the price. The industrial equivalent, while not cheap, is far more reasonably priced.
Regards

Bicycle man

Try keeping your contacts clean and tight in the first place; and, some extra money in your pocket.

All excellent advice.
However, let me insist that conductive grease is usefully and successfully applied to moving /sliding surfaces to improve conductivity.
As you doubtless know, "conductive grease" is the industrial, non-trendy name for branded products such as "SST contact enhancer, by Walker". It is also considerably cheaper when called that, rather than the branded equivalent.

However, if you have top-notch connectors you rarely mess with, you probably don't need it. If not, it can help improve the contact, especially the single-ended ones. Regards.

Hi Tvad -- excuse the dealy. Here are a few possibilities one or two or three or four.
Frankly I don't remember which one I've got. I clean this stuff quite often & reapply (2-3 x year), however, for fear of migration.
Regards.