Those ads look good, but they completely forgot the important thing: SHOW OFF THE GUI!
Dude. Orange, black, blue and white. The GUI looked like it was in CGA at the time. One could comment that the Apple GUI of that era - being as it was in B/W (heck it may have even been 1 bit, unsure) - was equally ugly but you can at least say that the "choice" of colors on the Mac had a certain minimalistic functional elegance. The default GUI colors on the A500 were eye-searingly
bad. Showing it in the ads would've made people laugh, not contemplate purchase.
Of course you could make the argument that it could be tweaked (and it could; I used mine in a pre 2.04 "greyscale"), but if C= had done that how many people who may have bought based on advertising would've gotten the machine home and, upon seeing the horror of 1.3's color choice, assumed it was "broken"?