Who would trust the average customer over an issue like screen ghosting ? Even if 99% of rMBP's owners said that they had no screen issue it still wouldn't mean anything at all. Many could actually have the issue but lack the level of perception required to notice anything.
To speak about a competitor in a different market, Samsung has been pushing their amoled crap for a long time now in the smartphone sector, and it's still the most popular brand to this day. The S3 cost as much as something like the One X, except that the S3 has a screen that is dimmer, less sharp, worse, unnatural colors and worst of all, is that amoled screens tend to severely suffer from burn in over time. People still chose the S3 over the competition in the android market, no matter how cheap its body feels (flimsy plastic vs harder plastics), no matter how bad the screen is.. I could understand the choice if the S3 was cheaper than the competition, but it's not.