I use the Marriott website all the time, and it drives me bananas that the advance purchase prices are right in there mixed in with options that can be canceled until the day before. I never use advance purchase. I've made mistakes a couple of times, booking advance purchase rooms by accident (especially on my phone!) and then having to call Marriott to beg them to let me cancel.
I wish there was a way for me to turn off advance purchase options, so I never see them. Is there any way to do this? Would other people like this as a profile option?