A plant will wither if you don't water it everyday. Just like HYIPs, if the thread don't get bumped everyday, people would think that the company has no more believers/investors. They need to keep the popularity of HashOcean. The only thing that will make all those believers disappointed is when HashOcean finally runs away together with their hopes.
Untill thread is bumped hope is alive
But to be serious, i think it is because HashOcean is besides Eobot longest running Ponzi. Everyone expect that with rising price of Bitcoin they will collapse very fast, but it looks like they don't have this in the plans