I read whitepaper of all ICO project which i join. Whitepaper has full information you need about a project. It's worth to pay time to read whitepaper. For investors which didn't read whitepaper, they are not smart investors and they will lose their funds some they, because they didn't read whitepaper, and fall in scam or bad projects.
Now, many people seem to be surprised that the other guys do not read whitepapers but it happens really very often. I guess people are simply too lazy to spend their time to look through this important information.