In this day and age, probably not. If you haven't heard, brick and mortar game stores are dying, and the big box stores generally sell at discount.
I am not convinced that the lone new player looking to start a group is anything other than mythical, or as good as mythical, as far as marketing strategies are concerned.
I mean, just logically, it doesn't work. If you're really ignorant of the game, you don't even know it requires a group! You can't be looking to start a group when you don't know it takes a group!
Thus, if you're actively looking to start a group, you know something. Maybe not much, but something. So long as that something tells you that you need the PHB, you're in. Most likely, you've been given an outright introduction to the game by a friend, and then you have all the information you need. And, it isn't as if a young, curious geek today isn't going to go to Google and ask the internet to find out!
The "don't confuse the ignorant on the shelf" line only works for impulse or gift buying. You're right there - if Grandma's looking for a gift for Johnny's 12th birthday, she's going to get a little lost. Back in the late 70s and early 80s, when there wasn't an internet or a population of existing players, that sales channel may have been important. It isn't clear that now it is really relevant.