It sounds like you've hit some unfortunate combination of deeply discounted economy and/or expensive flexible fare premium to get to that markup -- for 5x you c

It sounds like you've hit some unfortunate combination of deeply discounted economy and/or expensive flexible fare premium to get to that markup -- for 5x you can generally get into business class on long haul flights. I've flown premium economy quite a bit, and generally the markup seems correlate pretty well with the difference in area (ie on the order of 50% markup for 50% more space, considering both pitch and width).