Of course, she wasn't afraid of someone stealing her paintings.
Before her paintings were sold, she never stamped them with her seal, so even if they were stolen, they wouldn't fetch a high price.
Only after a sale would she add her seal, and her fame would make the painting's value skyrocket.
It's not to say that paintings without her stamp are worthless, it's a form of recognition. Also, there are very few people who can discern the authenticity, so no one would risk buying them haphazardly.
There's also a situation where the paintings remain unstamped, and that's when she gives them away.
Lin Zhi, of course, knew those paintings were expensive, and she had no intention of buying; she just wanted to get close to her...
"I know," Lin Zhi nodded, "I've looked into your reputation and know they're all quite pricey. But I'm sure it's because they're worth it. I'm planning to buy them as an investment, who knows, they might appreciate in value later on."