I think that without any kind of evidence at all that someone is "stealing" the ponies, we shouldn't make assumptions that they are stolen
I only wish there was a Taobao back in the 80s and 90s when all the prototypes, color tests and franken ponies from the G1 lines were coming out - as it is, just a few of them have trickled down to collectors. It makes me shudder to think how many ended up in landfills...
I looooove my prototype ponies from Taobao