Yes, and also just as scarcely any a robber wants to become a murderer, similarly people will shy away from violence against kids.
Both for moral reasons, but also because the penalties are tougher.
(And not just the legal penalties. I would assume you also run a higher risk of a bystander rushing in and becoming hero. And of your prison mates later ganging up on you. People _love_ children, not just their own, and many would gladly give their lives for them.)
Yes, much, much, much cheaper than the life of a kid.
Used electronics don't sell for much these days, especially the Switch which barely hits around 300 USD new. And then you have to find a fence, and potentially deal with serial numbers being tracked (especially when it comes to violent crime against children, even lethargic police spring into action).