Chinese products

I'm a little confused... Please bear with me

I recently reviewed a Chinese push pull amp for 600+ dollars as was pleasantly surprised with the sound quality( prev post)

I now see it for $50 more  on the same website.

I started looking at Chinese high end products like Line Magnetic an Sophia. (Please see glowing reviews on Stereophile). They are often 1000s of dollars more. The lm518ia( per SV $4450) caught my attention but the specs match up very close to the mc13s($600+)! So what am I missing?

Also, I see the above lm 518ia 835 integrated now selling for $1800.

This price volatility got me thinking:

Are all these products in fact the same? with the hope that someone will pay more for a variety of reasons?

This may be another thread, but who in world would pay or sell an amp for 114,000? ( Boulder)

Thanks for you input