There can be a lot of places to used alt coins if the developer are serious want to develop it, some of the coins can be used for certain game, some can be used as the reward in exchanges, there are some places accept alt coin for transaction payment, but all of that still in small scale
I agree with you, at the moment the price of altcoin is quite low but its potential is not low in the world of cryptocurrencies. It could be a reward, a game like you have listed. After all, it is still valuable, in addition there are still altcoins that are reputable and highly valued.