naturally, i've worked with many many many SSKs, a large potion of which were sourced from taobao.
almost universally, taobao sellers were selling boards with ruined internals, or internals that had a small amount of damage that they then covered with hot glue and ruined. i even made clear to these sellers that i was only interested in the boards for parts and did not care about any issues at all that the board may have, yet they still insisted on kludging broken parts together with hot glue and gumption. personally, if i were to pick up this lot, i would not pay more than 75/board (note that the going rate on taobao is about 40$/board). the labor involved in tearing them down and rebuilding them far outweighs the value of the parts.