50/50. Some are are, some are not. Really what you need to look for is real-word use case. Is this ICO solving a problem that actually exists? Yes or no? If the answer is no or not really then you know that the ICO is probably a money grab and won't survive post ICO.
Let me give you an example of an ICO that has a real-world use case and will thrive: LINKCHAIN.
Why LINKCHAIN? Because they are solving a real problem that exists for freelance workers and for business that hire freelancers. At the moment they are both limited to platforms like Fiverr, Upwork and Freelancer. These all change 20% fees - this really eats into the profits of freelancers, forcing them to increase their price and charge customers more. And because of this high 20% fee, these platforms restrict communication between both parties for fear of them taking their business off the platform.
The alternative is using LinkedIn. Why? Millions of active daily professionals including freelance workers and people looking for their services. The problem with LinkedIn through is this: You are restricted to 1st and 2nd connections and even then a search for instance for a graphic designer would likely bring up thousands of results, most of which would not be suitable. The other big problem with using LinkedIn is the lack of safety and security for both parties. Both have to trust that the other party will pay for the work/ or deliver the work that was paid for. This results in a lot of unpaid for work and work not being delivered. Hence people go back platforms like Fiverr, Freelancer and Upwork and are forced to pay the 20% fees.
Solution: LINKCHAIN is the solution for this problem. Through the LINKCHAIN decentralised app, users will sign in with their LinkedIn user details, and then be auto-matched with suitable people, saving potentially hours of time. And because it's run on the blockchain, smart contracts mean that buyers will not pay for their work until certain conditions have been met and the work has been received. This takes away the need for each party to trust each other. Each user though will also have a rating based on previous transactions that all will be able to see. And instead of 20% fees, freelancers will pay a max of 5% in fees, saving both parties significantly.
The result is a platform that is much cheaper to use, gives freelancers and buyers access to potentially millions of daily users, automatch means they save time needing search through thousands of potential people, and their safety and security is guaranteed through smart contracts on the blockchain.
Based on the above, I can't really see LINKCHAIN not taking quite a large market share away from it's competitors and therefore I believe that as a company they will be financially very successful - very good for token holders.
Sorry for the long post but when I'm passionate about a project I can't help myself ; )
+1 for team LINKCHAIN. SkrillaKing did a YouTube review on them last week:
https://www.youtube.com/watch?v=sUfgrqqBugI&t=6s