I'm curious how much of it has to do with perception too. I avoid Walmart. I don't feel they treat their employees well, pay them well, or do anything well, fwiw. I much rather shop where i have the perception that the employees are happier.
So, just because Walmart is paying them better, does not inherently mean they are happier OR that i know they are being treated better. I had no clue, and thusly have not changed my shopping habits at all.