"One man's garbage (trash) is another man's treasure."
I love consignment shops, flea markets, antique shops, Goodwill, Salvation Army, garage sales, and WalMart & Target clearance sales.
Guilt will never be a selling point to me. In fact, most people recoil when you try to shame them into action. My son harped about shopping at WalMart for the same reason and I told him, "Look! Do whatever YOU believe. Don't impose your beliefs on me with guilt tactics."
I've been in marketing for most of my life and I've never used guilt and shame as a motivator. Most high level business people can see right through that strategy anyway. It's not a good business tactic at all. If I believe a product or service is excellent, I can sell it and maintain a 90% closing rate. Actually,
ANYBODY can close a deal 90% of the time with nothing but the truth if it's a reputable product or service.
If you believe with all your heart that staying out of WalMart will change the world, then live what you believe. If you would like others to follow, don't use guilt and shame to do it. Speak to people with only the truth of a matter and give them the room to reason it out for themselves and make up their own minds about it.