If it's an ICO then chances are it's a scam. But even if an ICO is not a scam, you wouldn't know in advance but only after it reached its goal. Sure, you can invest and get lucky but then what you're doing is not investing, but pure and simple gambling.
I'd even go one step further; if there's a coin for which the "devs" are clearly interested in money (especially early on) instead of funding their projects themselves, then it's very likely a scam or just an overambitious project that will never happen but in this context that's also pretty much a scam as well.
This is good information.
I'm trying to help everyone out and show them an example of a good ICO. First of all, I've a demo of the product. It also demonstrates that people want to use the product as it already has users. Every other ICO that I've seen has no product and you're investing in an "idea". Not only can you get scammed this way, you can also invest in a failure. They devs may not actually have the skills to produce what they promised.
If you do want to invest in an "idea" and support a dev who otherwise wouldn't be able to fund themselves, then I'd recommend investing in a public person who's comfortable giving out quick and regular updates every week.