You guys crack me up.
First, I don't know what the hell you people are doing to your floor mats. I have 44,000 miles on mine, and the only evidence on the floor mat is a compacted area of the carpet in front of the accelerator that would probably fluff up with a bit of brushing. That includes many miles with steel-toed work boots, hard-soled dress shoes, running shoes and sandals. That spot in front of the accelerator is the only place that should have any significant wear at all, since you shouldn't have your heel on the floor when using the brake or clutch anyway.
Second, I'm not worried about that compacted area, nor would I even care if there were holes worn in it, because the floor mats are a
wear item. They're meant to be replaced. That's why you have removable carpet inserts instead of just putting your feet directly on the floor carpet. An entire new set costs around $75, and replacements will be available for years to come. Even when OEM replacements are no longer available, you'll be able to get aftermarket replacements that look just like them.
These heel pads just seem to be a solution looking for a problem.
By the way, when I flipped my carpet over, I noticed this on the bottom:
Anybody know what that is? It's some sort of date code with months across the top, but what do the WK1, WK2, WK3 stamps mean?