why do people feel the need to buy expensive cable

I have tried expensive cables and one's moderately priced. I would say there were some differences but I can't actually say the expensive cables were better. IMHO I believe a lot of people buy expensive cables because they don't actual trust their ears and are afraid of making a mistake. They figure the expensive cables are better for the fact they cost more. If you have a difference of opinion or share the same thoughts, I would like to hear about it.
"Typically you ended up with the money because you were smart enough to put yourself in a position to even have a system and afford the hobby."

Something tells me you don't live in the US. Over here, typically someone does go out and work for the money. Quite often, though, someone else ends up with it.
If one has settled on on a single core, solid cable (which I have) then there's not much that can be done that others have. Get a good enough purity, use bare ends, anneal it a few times, even cryo it, and the only variable left will be which gauge to use along with which sheathing works best for you.

As much as I love the sound of some multi-strands (Supra Ply and Zu Mission) and the lovely, melodic presentation they are capable of, they tend to only capture about 80-85% of the extension and air of solid core. They capture probably best, the sound of a live event, to a point. Some detail is missing along with the air and extension mentioned but if that's all I had on hand, I could happily live with them. But I like the detail, tone, texture, extension, definition and presence of single, solid core. There is no glare, hype or etch, just a much better focus and clarity.

Having said that, I know there must be some brands of stranded out there that close the gap on solid core and all the R&D and material needed to justify the cost but in the context of my system, single, solid core gives a mighty fine, dare I say, excellent, acquittal of what is possible, desirable, and satisfying.

It's all system dependent.

All the best,
I should have been more precise and say that when purchasing, go for a make that has been annealed, cryo'd, or anything else that can be done to suit your needs. It was implied on my part.

Oh, the nature of these threads.

All the best,
I wasn't finding fault. I've annealed metals before, but not cables. I just wanted to find out what you used to heat the cable uniformly and at what temperature.