I've been using Megs and Mothers waxes for my personal vehicle and I though I would try some of the better carxxxxs that have been suggested here at DC. I was surprised to see that the prices vary from $15-$70. Do the higher cost products provide any noticeable benifit to the "average joe" hand wax job? Do they provide better or longer protection or a finish that the average person would see a difference in? $70 for a tub of wax seems pretty steep to me, am I missing something? 
And why do the x's get added to carxxxx?

And why do the x's get added to carxxxx?