Actually there are many other factors at work in determining the life of one's tire through skidding.

Skidding technique comes into paly a lot here. For example: if you can skid in multiple positions during the pedal stroke, then the number of skid patches will change.
Also the way you skid- If you just skid in a straight line, rather than 'powerslide/fishtail' the rear of the bike, the skidding wear will be different.

For some, myself included, when I lay down a big skid, tend to push the cranks backwards during skidding, so the rear wheel actually is traveling backwrads, but the bike is skidding forwards. I also like to let the pedals 'move' slightly when skidding forward and backwards- whihc also distributes the wear over the entire the whole tire more evenly.

Tire size, material and construction all are important when thinking about tire life and skidding.

So my friends, just the raw # of skid patches is not the only thing in play here.

My real life experience:After 1+ month riding 44x16 (4 skid patches), with lots of skipping, some skidding, has left me with a pretty evenely worn tire , probably due to the factors that I outline above.