The problem with these is the fact that you can never know whats going to happen with ethereum at all, I mean I remember when cryptokitties when first started and there was so much attention to it that people made insane amounts of profit from it, however when you look it at now, there is no way we can say it can do the same thing once again.
So, when you do something like this, there could be a lot of stuff going on because there is a new dapp or basically just a reason to do it, but at the same time there could be nothing at all and you may end up losing money, we will never know which one will happen. You basically just gamble this money away and you end up just assuming whats going to happen and roll a dice, maybe you will profit, maybe you won't.
Yes, I was researching the CryptoKitties case. It drastically increased amount of transactions on the network that time. It was almost 5000 txs an hour, with average 300 txs an hour.
But now Ethereum has almost 3600 txs an hour at average, so CryptoKitties won't congest the network if it would launch now.
But I still have the same concerns.