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reprint - 6:58 am on Dec 14, 2009 (gmt 0)
One factor for me is that I want to be able to sell a website at some point. With WordPress, you have a broader range of potential customers including those who dont want to go hiring someone to take care of the website. WordPress.com also provides customers who are ready to take the training wheels off and have a standalone site. WP is ideal for them.
I also default to WordPress for a lot of the reasons above. I have used shopping carts with it without hassle. I also use WordPress MU a lot to build out domains and am really looking forward to the code merge.