If you have $100 right now than just invest that in some promising ICO which is currently open for investment. You might get more than 10x return within a year if that project got successful. Look at Monaco for example, price has skyrocketed after few months of their launch.
Yes I have gone through similar dilemma and regrets before but I used to forget them saying that it was just another unlucky day for me. Stop thinking/regreting about things which you can't change now.
I am not sure that is a very good decision for him. How about he puts his coin in a shittycoin and ends up loosing all. ICOs are not something the OP should gamble at this stage unless he is sure at least with thorough information that it is going to be worth it.