The Misunderstood 'P'

The 4 p's of the marketing mix should all be carefully considered when marketing a product and marketers have to carefully decide which of the p's to focus on. Price, promotion, and product are the 3 p's that the customer notices most. Naturally, the customer will want to know the price of the item that they are buying so this may be the most important part of the marketing mix, in the eyes of the consumer. A customer will also want a high quality product, so product is very important also; and naturally the customer will need to hear about the product, so promotion is also very important. But the remaining element of the marketing mix is often overseen by the consumer.
The place variable involves many different elements in itself, including distribution, inventory, etc. The placement of a product in a store often goes unnoticed by a customer, however. For example, in a supermarket next to the checkout there is almost always candy bars, magazines, and other small gadgets that many customers buy subconsciously. I believe that the placement of these prodcuts boosts the sales of the grocery store a lot. This placement variable can be very important for marketers looking to sell their products. Again, in the supermarket, the basic staples (milk, eggs, bread) are almost always in the very back corner of the store, so that when a customer goes to purchase these products they must walk pass every aisle and often times they will buy more than they originally came in the store for. This is why I believe that the place variable of the marketing mix can be one of the most important for marketers to take advantage of. Do you agree that this may be the most important variable for marketers? Do you think any of the other variables go as unnoticed by a customer?