1. Project came very early and spent many years without being highlighted in mainstream.
When kraken opened, they also traded Namecoin. However and for whatever reason, they decided to unlist this coin.
2. Low marketing.
3. Not quite attractive website.
4. Small and quite inactive community.
True. But my gut feeling tells me, that this is changing. With respect to the website: Who cares? Imho this speaks for this project. I cannot stand those stupid websites for tablet wiping without any information about the technology.
5. There are many other mouthwatering lucrative projects to invest.
This is what those projects promise via their colorful and trendy pages. However, most do not provide any real benefit or are even scam. Clearly, people can jump from project to project for investing their money. At least, too stressful for me.
6. Except Poloniex, no other big exchanges (but still volume of NMC on poloniex is quite low).
cryptopia seems quite nice for trading Namecoin.
7. Quite an old coin and many have long forgotten its existence.
True.