what should be the appropriate investment amount towards an ICO?

Also I have known that some companies they are very active in building up the relationship with investors on the online platforms. Yes they may know about some blockchain information and skills, but they could not really handle or help with other teams to run the whole project, might also mislead the ICO development plans, as recognised by some industry enthusiast, so I think it is really really very hard to recognise whether any trustable company or project teams.