If you're into cloud-chasing, I can understand the appeal. But if you just want to vape "normally" or "reasonably" (bearing in mind that normality and reason are somewhat subjective concepts), I don't get it.
Me, I vape a small RDA with a single coil, and I get very decent clouds at 15W - at least decent enough to feel like I have a mouthful, and to scare my company's doctor into reminding me that I "can't use a locomotive like that indoors" (sic). If I want more flavor, I *lower* the power to 11W, and even less with some juices.
If I ran a dual-coil setup, I could see myself wanting double the power I currently use to get similar results - so about 30W max. Say even 40 or 50W, to play with even more complicated coil jobs and thick kanthal, or to be able to draw quick tokes instead of slow drags. But anything beyond that seems totally over the top to me. I just wouldn't know what to do with the extra power
But one thing is sure: choice is good, and it's a free market. Just for that, I'm glad those power plants are available at all. *I* wouldn't need one, but I'm glad those who do have the opportunity to procure one.