https://bittrex.com/Market/Index?MarketName=BTC-DCR Currently showing an account with 23.7k dcr and one with 18.5k dcr. My best guess is that these guys have invested heavily and bought the dcr using BTC, but is this really likely? Should we be concerned about such an accumulation?
The first balance has been holding since .006, and has been getting more. It's most likely someone heavily vested and going to hold for quite a while. Because it didn't go to PoS, he still probably plans to speculate to some extent, but not below .006. The second balance started accumulating recently (around .0035) and has steadily been growing. He also padded the bids with ~100 BTC, so my guess his end goal is to pump. I don't know if that's 100% true or when it will happen, but seems quite likely. Could be causing a bubble, but I don't think that's a big problem. All in all, I don't think they are a cause for concern. Reasonable patterns and speculation.