I understand your concern and I do agree with you in a lot of points, but there is no other project that I know is that interesting as Tau is, I also invested a significant amount of resources into Agoras, but I know that this project as disruptive it sounds has it's chances to never see the light and I'm fine with it.
I've been following some other projects in the crypto world, and being doing some good profit "playing a little", but as far as I understand Tau is a game changer, if this success it will mean a lot. But again, agree with you on the secrecy and I also would love to see something tangible. But like old good brandy, we may need to wait a little and I'm patient.
As an investor in this project I like it to succeed, therefore I'm willing to help in all I can for it, maybe it's not too much but I'm here for the project.
Have you seen
http://intuitionfabric.com ?