Do you invest in USD or any other currency? No you don't. You speculate it's price will appreciate or devalue against another currency. That is how SBD is supposed to work, like any other currency. Or you trade against another currency because you need that foreign money.
What increase the price (long term, not short term) of a company stock? Increase of the value of the company. That is how STEEM is.
So, SBD doesn't have an utility except speculation, therefore there is no reason for anyone to buy it.
And why would people buy a share of the blockchain (STEEM), if this place is totally unnatractive for the general people?
Why would I invest on something that it isn't increasing in value?
Unless those that have the power (big stake owners) get this instead of squabbling over things that doesn't matter, steem will keep on sinking. And this is not speculation. It's a fact. A basic economic fact.