"How much?!"
"20,000 an hour, which comes out to 5.55 per second."
"Why don't you go rob a bank instead?"
"Robbing a bank is illegal, but practicing medicine isn't. It's a free market, and nobody's forcing you to come to me. You can take it or leave it. Is your son's future not worth a few bags to you?"
There's really no other choice but to accept Xiao Qian's terms, as Aunt can't find anyone else.
If Professor Liu knew about the price Xiao Qian was charging, he'd probably be furious. Ordinary doctors only charge a few tens or even less per hour. Liao Fugui was right when he said Xiao Qian was distorting the market price.
But people seeking Xiao Qian's help are desperate, and they don't care about the price, especially since they feel she's worth it. On top of that, they're all keeping each other's deepest secrets, so no one's going to complain.