1. To have a "POY" that means anything, the voters should be required to own all of the products in their respective category, or else the whole thing is worthless. And that in itself, seems impossibe to accomplish.
I refuse to vote for Product A, even if I love it, if I haven't given Products B and C a try as well. And owning the product isn't necessarily proof that the owner knows how to use it.
2. The 7000 dollar Zymol wax is worthless if left on the car in 96 degree heat for 4 hours, and you wind up scratching the car trying to remove the hardened product with a rotary at 2500, and a wool cutting pad. The owner would have been better off with a 3 dollar can of Turtle Wax applied the right way.
So on to my second point: The person applying the product can be as or more important than the product itself.