I used to never use Xianyu because I thought it was just a place to sell second-hand stuff, and there were a lot of fakes. Later, I realized you can really find anything on there.
Here are the things I know about so far:
KFC breakfast, coffee, and Da Shen cards can be ordered through others
Movie tickets—these days I usually pick my seat on Tao Piao Piao and then place the order on Xianyu. It’s usually at least five yuan cheaper.
JD PLUS orders through intermediaries
NetEase Musicians—verification and completing tasks
What other hidden gems have you all discovered? Feel free to share!