Any invest in ICO take risk, especially if this doesn´t supported or not have time at the market. I meet people who invested more than 5 BTC in new ICO project and loss their investments, I know is a difficult to talk about it, because it´s about our own investment. This day i look for good new ICOs projects (previous analysis of each one) and decided to invest in these, I would like to have a reference about how much money normally your invest in a new project? 
The most common practices that if you have doubt in a certain investment is just to invest only what you can afford to lose so that in case when the ICO goes wrong like a scam or a failure project then everything is fine then. If i'm very certain that its a good project then i invest the minimum order quantity but i will have the bonus token anyway.