Black Desert is doing so-so in the West. 30k isn't something to write home about. It's not bad but it's not good.
And? It still means an MMO had to change from the cesspit it was to get anywhere decent.
Considering the past results of the majority of MMOs in terms of quality I don't see any issue with the assumption. There are way more that have done bad than have done good. Or ones that were good and went to shit like SWTOR and Rift.