I recently purchased a set of Khin of Cambodia cups from a member at the Magic Café. They were pretty rough and the detail seemed hidden in a very bad finishing job.
I used straight household bleach on a cotton ball to lighten them generally (they were as dark as can be, with virtually no detail showing and the pores were filled with dirt and sanding grime. After bleaching the surface and letting them dry for 2 days, I attacked them with fine sanding paper and then steel wool. I applied 2 coats of shellac (blond shellac flakes, dissolved with mineral spirits, 1-6) and then got to work French Polishing them. I'm about 90% done and am considering stopping right here so they have a rustic appearance and don't shine as if freshly dipped in oil.
I know I should have taken a "Before" picture, but I didn't.

( I'll learn someday. The previous owner may chime in and verify how dark and dull they were. "Were" is now the operative descriptor, as they now look like premium cups. They feel wonderful in my hands too.
Here's a pix:

These cups are very thick, in some places over a 1/2 inch thick. They comfortably hold a tennis ball load.
So there is hope for $50.00 Asian cups. With a bit of effort you really can take a pig's ear and convert it into a silk purse.
Thanks for looking.
dsalley13