Because they get to perform in front of a massive crowd. What performer doesn't want to perform in a stadium? This gives them exposure for their song. Also performing with Taylor gives them media headlines and thus they get more exposure for their song. These artists wouldn't do it if they didn't think it was a good career move.
Im a poor Polish hag. Always dreamed about seeing Taylor live.
Dear Taylor Nation, if you read this, Please know i cant afford a plane ticket + tour ticked + acommodation in a foreign country. We have a very small minimal salary here. Every day is like fighting for tomorrow. I wake up, not knowing whats gonna happen the next day. I wanted to go to London but i have to support my parents in their mortgage horror. My family life got ruined by that and Taylor's money helped me go thru the most difficult time. Please contact me via PM.
wtf? no? it's the official Chinese website to sell her merchandise, mentioned in the news revel posted
Chinese and Korean websites are so ******, they load like 5 minutes then lag my whole browser 
