There are a couple of ways to look at it. Being we consume fewer cards at higher counts, we help the player infinitesimally when we play at all, and we hurt them slightly more than that when we Wong in/out.
On the other hand, I assume that when a ploppy asks your advice, you give a Basic Strategy answer, and given the skill of the typical player a simple Basic Strategy lesson will save them more money than you could possibly take with your Wongery.
So if you feel bad about Wonging, tell someone to hit that 12 vs. 2 and that A7 vs. 10, and you will have given them back far more than you have taken.