Nice. But also, whilst the Digis are undoubtedly popular, doesn’t it also suggest that they are some of the most flipped units, seeing as Reverb is primarily second hand gear? 
I’d say it means precisely that, especially given the other top sellers are “starter” synths like Volcas, low-end Korgs, cheap Behringers, etc. I’m not sure that’s great company, TBH. On the other hand, the average price for the Elektrons is closer to retail (new), so maybe in fact the Elektrons are just selling well new.
Ya, even though it MIGHT point to “high flip/turnover rate” - I think it’s more just a good indication of what’s in the market. Everything has a turnover, I know a lot of people who have sold their Digitakt only to want to buy another one within a month anyway! 
Maybe these numbers are just bloated because of seller’s remorse 
Volca beats owners graduate to the digitakt. Some digitakt owners sell for an OT or AR?
Well, yes, I have sold my Digitakt in one month to buy Octatrack (2nd year satisfied) and I’ll definitely sell Digitone one day to try Analog Four.
I can tell you that both the digitone and digitakt sell like absolute hotcakes. There’s a reason big manufacturers were suddenly interested in making grooveboxes and FM synths these last 2 years.
I think everyone just got tired of vitrual analog clones of vintage analog stuff. For some reason FM is marketed as something innovative, without direct references to DX7, etc.