TeachMe, the problem is you're not in the majority (that's probably true of most of the people who frequent PPRUNE). You and I check Seatguru, make a judgement of cost vs. comfort and convenience, in short we try to make an informed choice.
Sadly we are the exception, not the rule. Most of the SLF buy based on price, with a perhaps a slight consideration to schedule.
While I have no objection to saving money, I made the decision long ago that I'd try to base my buying decisions based on value, not just price. Sadly you and I will remain the minority for the foreseeable future.