Where does it end?

I guess it ends when you quit buying cables for $4300.  It's your choice.

Having a hard time understanding the question. What do you mean, "end"?

Payment pains.. They come they go... Then you deliver. OUCH..

Really want to spend money start changing spouses.

They get all the equipment and you get the bill, your doing fine.

LOL 

Regards

Last month I spent $4,300 on a pair of *used* speaker cables.

You just got started...why do you want it to end? :-)

You have to understand what makes a system sound better to you and there in is the issue with most people.  Comes back to tubes versus SS, copper/silver.  Once you figure out what makes something sound better you don't have to chase sound.  For a few bucks and knowledge you can change resistors, capacitors, AC filter chokes, etc.  Component design such as point-to-point wired, separate power supply, quality of transformers, etc.

Happy Listening.