I think even they can not accurately predict what amounts they will collect. The interest of investors is decided, but as time shows, it is much less than the market that is in a bad state at this stage. Investors in such a market try not to invest, and even mega popular projects are not collected very much.
Hey there! Here's what Ian White from ZCP team said regarding this:
"We have raised a significant amount off blockchain in the private pre-sale but have decided to not publicly communicate this amount just yet. We are using this investment and our resources to build our system ready for October 18 launch in the UK. This is one of the reasons we are yet to release a public sale date, as we want to have a quality working product in place first to give potential investors and supporters confidence in our ICO."
When there is no transparency about the amounts collected, this causes a negative. I do not want to throw my money and invest in a project that does not try to show such information.