Because AT&T is the only provider with a decent WP7 selection. I just want them to be honest. I was "absolutely gauranteed" the phone by 4/6. Between the order screwups, and the various people at AT&T having no idea what they're talking about, I was also told it's "first come first serve". That's completely different from "we guarantee the phone by 4/6". If they were honest I would have no problems right now.
I'll be the first to admit I'm an idiot if the phone arrives tomorrow, but if it hasn't shipped by 3:35 PM CST I would highly doubt that it shows up tomorrow.
Also, I had this shipped to work based on the 4/6 promise. If it ships on Saturday that means an out of the way trip to work as well.