It is a strange thing.
I recently bought a JBL Soundgear. That is a horseshoe shaped device you put over your neck with speakers that point up towards your ears.
MSRP for the regular one is $200.
Bose also makes one for $300 MSRP.
In my research, the Bose model is reputed to deliver lower bass (out of what I would guess are 1-3/4" speakers),but the JBL is reputed to have clearer midrange. I would be willing to pay a bit more for the bass, but not $100 considering the midrange woud suffer.
However, when I started looking at pricing, I found World Wide Stereo sells the JBL SoundGear, NIB, for $125 via eBay and the Bose is $300! No contest since the Bose is restricted to full MSRP! I'm not sure whether WWS is an authorized dealer for JBL, but I am not too worried about what is essentailly a small wireless speaker failing in the first year.
So if you are the little audio shop on the corner, you are between a rock and a hard place. On the one hand, the price controls prevent BestBuy or Crutchfield from undercutting your price on the exact same item (which is beneficial). On the other hand, you generally end up selling a product that is overpriced compared to similar products from another manufacturer which does not require price controls Which is damaging).
Bose manages to maintain a false (certainly false regarding their home speakers) competitive edge because of their devotion to marketing.
Interestingly, I think JBL may have MAP because it seems like most of the mainstream distributors always have the exact same price on JBL items and the sales are also synchronized.
I think a lot of these companies have different levels of enforcement policies, for example if a dealer offers you a product at MSRP if NIB, but then gives you the option to buy their demonstration unit at a 25% discount, does that violate the agreement? What if that dealer sells more "demo" units than new units?
I think some companies might be perfectly fine with this while others might give you a "cease and desist" warning!