Mei Mengzhen agreed to give away the aromatic scents for a very simple reason. The scents were part of an unlimited production line, so she didn't need to worry about running out of stock while distributing them. Moreover, the price they set for the scents was not particularly high—in comparison to Xiyuan's usual pricing, that is. If one were to compare their prices to those of similar products outside, they would still be much higher.
The most important thing was that perfume and aromatic scents were new products that had not yet been priced for sale. Offering them as gifts would also serve a promotional purpose. So, giving away these two items was a relatively cost-effective deal.
After the giveaways had been decided, she and Fan Tianyu were constantly on the move. They finally managed to deliver the aromatic scents to the new Xiyuan just before the grand opening.
But I digress.