Of course things are not as simple as just a red ring, the red ring symbolises outstanding image quality, ability to shoot in rain or shine, ability to shoot in harsh dusty enviroment, ability to still continue shooting when other ppl already kept their cameras. When i was in alaska, with all the snow storms and harsh rain, those other tourists beside me already got their pns spoilt, their d90 with kit lens non functioning in the rain, the canon compact superzooms cannot retract its lens, the rain water getting into the canon 550d dslr with the 18-135mm kit lens. However using the red right equipments allowed me to still continue shooting and shooting non stop, just as if its a bright sunny day. I have no regrets spending the money for the extra high quality because wat happens ib the end of the day is, the red ring allows me to seize shots opportunities when the rest are packing up the camera in their camera bags and putting on the sissy rain cover.
And also if u are a stock photographer, when ur Pics are up against millions and billions or trillions of stock photos worldwide, u jolly well at least make sure u have the red rings to help u take pics of the highest quality possible, otherwise u will not earn a single cent!