If they could keep the stuff they do sell in stock, they could sell more stuff.
Madvapes has a lot of stuff that is usually out of stock. When they get some in, it sells quickly.
It's not just them.
There is still a big market, from low end build your own mod kits, all the way up to the high end reo and provari and darwin high end. Buzz Pro's seem to be able to meet demand for their regular models, but the ones with the beautiful veneer are hard to get.
The guy selling Reo's makes a batch, and they are gone in no time. The Provari website says there is a 1 week wait for the basic model, a 2 week wait for black, and a 3 week wait for chrome.
I've done a lot of shopping, a lot of research, etc recently, and I find a lot of places where they are selling something that catches my interest enough that I'm checking it out - but even if they convinced me that's exactly what I wanted, they are out of stock.
Even as I'm writing this, the roughstack that he ordered is out of stock at madvapes.