Now the investors can not trade Pi Coins. If you want that the project successfully launches a cryptocurrency that will be easily accessible and that can be used by everyday users you must be involved in mining the Pi Coin. On the other hand, you may also wait to buy it on an online exchange.  Whether it is good to invest in the Pi network is only your decision. You have to research the matter yourself first before investing your money anywhere. You should not invest your money anywhere if you are unable to afford the loss.