[somenameforme]

I expect Steam is already being DDOS'd probably close to 24/7. DDOS services are cheap, and there's plenty of kids with a card that think they're going to show off their 1334 haxing skillz after getting banned for using an aimbot they also paid for.

[Ekaros]

They are not exactly great in handling large peaks of traffic. They don't last that long, but they are still there. Controller launch had order processing issues. Any large sale start always have issues. Though it might be less load and more of making tens of thousands of background changes on items on sale.