I think it's the marketing of it. A decent amount of people I've talked to genuinely don't know that there's a reusable option. This also changed when the tobacco industry got involved. Vaping used to have more of a culture of cessation. It was talked about how you could transition from cigs at a higher nicotine level, then bring it down until you're vaping zero nic, then quit that. I barely hear anyone talk about the quitting pipeline anymore. I don't think it's an accident, I think it's intentional.

Edit: I also think it's the fact that you only have to buy one thing, and the 3 things (device, coils, juice) aren't available in every gas station like disposables are. And the user experience - open the box and it starts right up, no refills, all it needs is a charge once in a while. People are really fucking lazy, by nature. But the cost of all those conveniences is indebted tenfold upon the environment, as destruction and waste.

you've not met humans before ?

Individuals having desires is not "the problem". That would be corporations having free reign to behave however the fuck they want, so long as they can pay the fed.