You have a couple of answers already that give more guidance to the use of the numbers you find on various sites. It seems that buyers heavily weight price/foot as a true and strong factor in assessing the value of a home. In reality, it's only one of the, and one of the smaller values, that I use in that assessment. The true value, of course, is what a willing seller will sell for and what a willing buyer will buy for. Our effort here is to try and determine that value as accurately as possible so we have that seller and buyer coming together, sooner rather than later.
Most of our experience in real estate is built on many factors. The decisions that are made are based on a collection of information, not just one item. Whether leased land is right for you, or a single family home or a condo and community living, along with your budget, future earning power, your age, your famiily status - all are factors in making the home purchase choice.
So, keep your opportunities open by looking at all the components that makeup the whole.