Any investor invest any amount is appreciable as even a smaller amount will add up to become a bigger and in the last all of the coins will be out of stock in the project and then the developers will be able to work better for the development of this coin and will be able to list on many exchanges.
Yes they all will make a good investment if many of them come and add their support. Enough fund is required for a project to list their coin to exchanges as nowadays exchanges charge a high amount for listing any coin. In return of our money we are getting this coin and the money which we will invest will work for us in listing our coin on bigger exchanges of the crypto market.