I don't charge MAP, and I don't feel like arguing for or against it.
What makes me very angry is when a company allows an online retailer to display prices below MAP after forcing the rest of us to hide our below-MAP prices. I've contacted the manufacturer several times to complain about this, but the site still has below-MAP prices showing.
The site is almost a complete copy of the manufacturer's site, right down to the logo, and is breaking the MAP rules, and nobody does anything about it. They had my distributors cut me off completely until I hid my prices.