If I invest $100 in MSFT and you invest your entire life savings in MSFT when the share price goes down it kind of does matter.
>If you're gonna take risks that involve catastrophic failure anyway you might as well bet big on upside
Or, to put it more reasonably, if you're going to take high risk opportunities do it with a chunk of investment you're able to lose, don't risk your entire company on it - which Softbank seem to do. Does it not concern you that Softbank almost managed to bring their entire business into jeopary because of a single failed investment?