What happens then when you set it up, get it ready, and it's stable, and they just say "Oh well nevermind. I found another host while you were doing that." Or "Oh nevermind then, I thought this was instant, even though your site says it's not.....I'll just assume what I want, and consider you taking too long, and now I want to cancel."

Now, you're left with wasted man hours, wasted parts (if you're building the server), and wasted costs at the DC, and you made $0.

Not every company is fortunate to own a datacenter, and can afford to do this, and for those who don't own their own DC, that scenerio is a huge wast of staff time, and money.