Depends upon the scenario, what value coin is providing or how robust is the project.
There are good projects too which are at their initial stages.
Here is a project which I found promising where one can earn coins forever. Worth investing.
It's a good project and is in its initial stage. Intended to work for IOT and Nano-Tech.
Seems profitable.
They introduced PMA (Permanent Master Address), most probably they are restricting founder's profit and providing the same to miners and investors.
More Info about this crypto and project is here Doppler Website
https://bitcointalk.org/index.php?topic=4553663.0
All contact links and information on their website.