How expensive is silk?

I'm curious, how expensive is silk really? Is it a luxury item that only the wealthy can afford, or is it more accessible to a wider range of consumers? I've heard that silk prices can vary depending on factors like quality, origin, and processing methods. Could you explain what drives the cost of silk and how consumers can determine if they're getting a good value for their money? Additionally, are there any cheaper alternatives to silk that offer similar benefits or aesthetics?