Magnetic RCA adaptors: Latest snake oil?

If you have a high resolution system why would you need this junk!!

High resolution is a subjective term and a relative term.  Besides, a rich man has about as much chance of entering audio nirvana as a camel has of passing through the eye of a needle.

Just a silly question, "Why would you want to introduce a magnetic field into the electromagnetic field around your cables?"

Because the magnets cause the magnetic field to leave at a right angle to the wire.

Probably, but I remember years ago when I moved by outboard transformers for some old
PS Audio power amps and told my favorite salesman (very timidly, since I didn't want to make it sound like I heard the huge difference that I had heard).  He told me that he'd been in the business 20 years at that point and if I "told him the amps got up and marched around the room",
he'd believe me.  You never know until you try, but some tries cost more than others.