You are still a middleman. There is still a trust barrier that all middlemen have. The blockchain removed that barrier, but if people trust bankers, then they should feel free to do as they please with their money. They should be reminded that there is never a "guaranteed" return when you have to trust people. There's always a risk, regardless of the confidence your have in yourselves.
Certainly you are not as bad as Goldman Sachs or Wells Fargo, but there's still time. I'm just shocked at the lack of skepticism towards the project, to be honest.
The fact that the people running it are all respected members of the community with solid reps probably helps. Regardless, we haven't actually had much interest. These sorts of returns aren't that enticing in this space.
Re: trust, the blockchain does not eliminate it at all. If I purchase something off you with SBD, I have to trust that you will post it. Even if it's a digital good I have to trust that you will send it. If we want to remove that we need an escrow service/middleman. Smart contracts may change that, but you are still placing your trust in whoever codes the smart contract, network, etc.