You're totally right — it doesn't make sense for every DApp to run on the mainchain. There's an inherent tradeoff between performance and decentralization. The

You're totally right — it doesn't make sense for every DApp to run on the mainchain. There's an inherent tradeoff between performance and decentralization. The major blockchains like Ethereum focus on decentralization above all else, because it's extremely important for a cryptocurrency where there's a real financial incentive for someone to attack the network. Performance is important, but shouldn't come at the cost of decentralization. There's a ton of smart people working on scaling Ethereum, and they will scale, but not to the level required to run WoW and Twitter simultaneously on the mainnet. Which is why we think scalability will be achieved through sidechains. A sidechain can play by its own set of rules. Something like an online game or community on the scale of Hacker News needs to optimize for realtime performance, but can make reasonable tradeoffs for security — on a blockchain data integrity is already ensured by cryptographic signing, and you can't "double-spend" a comment or post, so there's little financial incentive to attack the sidechain to delete a historic comment. I'd say the motivation for learning to build blockchain-based games now is because the infrastructure for this tech is coming very soon. We're in the process of building out one game as a demo to showcase Loom Network, and are talking to a couple other game studios who want to build games on our platform. Things like CryptoKitties may just be a novelty right now, but they're paving the way for new types of game economies that that we've never seen before.