You really can't pull numbers out of a hat like that. How many people live in an apartment with no front doorman, or requires a buzz code to get in? Probably more than 1% of Americans.
Or what if you ordered a shiny new laptop from Amazon? Would you leave it at your front door, even if you live in a safe area? I personally wouldn't.
Plus, These guys started in Canada, it's unfair to judge from purely American point of view.