I don't doubt that NEM is a great coin but what I see is a lack of investors
If you compare the daily volume to Zcash or Omisego there is a huge difference
And I am comparing it with 2 coins with lower market capital than NEM !
That is what calls my attention, why the daily volume is too low on NEM ?
And not only that if you watch crypto news NEM is hardly mentioned !
In my humble opinion this is call lack of publicity
All non PoW coins lack interest for speculators, their is less trade volume from constant churning from miners, so there's less action for day traders, but that just means that what volume there is will more likely be trading by actual investors I.e. people who like the project.
Miners make coins more active, but we should not co fuse activity for adoption or progress, not in the long run anyway.