Because analysts are "notoriously semi-accurate".
I worked in the electronics department of a certain ubiquitous retail conglomerate during the Wii rollout. Every Tuesday, late in the afternoon, three or four units would trickle in amongst all the other shipments. They would never last overnight; in fact, we'd have people calling the department ahead of time, asking us to hold one for them.
It went on this way for months. Not even once would anyone consider a competing product.
(Thanks for the memories, Newt)
But you probably didn't see people doing what I did. I wanted a Wii but I don't play that obnoxious game of chasing after a silly piece of consumer electronics.
Once it was clear that it was difficult to purchase the Wii for MSRP, I simply didn't buy it and never have. I eventually got a PS3, a lot later after I lost interest in the Wii.
I had a iPhone 3 and still use my iPhone 4 (which I got at launch without any problems) off contract for <$50/month total. The iPhone 5 and 5s and 5c aren't attractive enough for me but I probably will be in the market for a new phone when the iPhone 6 is released. If I can't buy one on-line or in store without jumping through hoops, I'll just buy an Android phone instead. They are good enough already so it doesn't have to be an iPhone for me.