For THC, they're cheap and convenient. They allow someone to try vaping without buying what people might think is an expensive "real" vape. Even though reusable vapes with 510 cartridges don't really cost much more, lots of people don't know that.

I tried a couple, once I found a strain/mix that seemed to work with my nerve and back pain, I bought a reusable vape and use cartridges now.