Invest something you can afford to lose, I have gone through this project and it's quite amazing. I know many similar projects which still struggles to perform till date. So you can invest in it, but don't put in what you can't afford to lose
Yes, we should always prepare for losing money because we don't know how the companies will react after they collect enough funds. That's why we should always research the companies before investing, even though we research a lot, but companies are failing to deliver the products.
Thinking the bad side of the investing is not a good arrangement in my opinion, the companies have the roadmap,whitepaper and the investors choose the project after they made their own research. Whatever will happen after the end of ICO depends on the team, the collected funds and market conditions. Some projects fail for not calculating their risks correctly for each scenario and the bear market wipes these types of projects ASAP.