(coll.) shill / tout / phony customer who pretends to buys things so as to lure real customers
调虎离山
diào hǔ lí shān
to lure the tiger from its domain in the mountains (idiom) / to lure an enemy away from his territory
诱陷
yòu xiàn
to lure into a trap
偷鸡不成蚀把米
tōu jī bù chéng shí bǎ mǐ
lit. to try to steal a chicken only to end up losing the rice used to lure it (idiom) / fig. to try to gain an advantage only to end up worse off / to go for wool and come back shorn