My entire source of income is based off of my website, this is really going to suck if my website goes down. Building a new website, finding a new host, etc. is going to take away time that I could be using to generate business, and customers who see no website (in the inevitable downtime) may move on to using some of my competitors... then they become loyal customers there and my overall income is decreased. This is going to cost me a lot if it isn't a smooth transition.
Why did I use iWeb/MobileMe