<font face="Verdana, Arial, Helvetica, sans-serif" size="2">Eventually, (hopefully sooner rather than later) we will be in a brave new world where fares are rational and reasonable, and the price of J reflects the true extra cost of service, not a bribery for airlines to induce the spending of Other People's Money.
I'm watching right now Delta being blown out of the water in ATL with folks like Air Trans and now Jet Blue -- $99 one way fares to LAX, (no restrictions) in Y, and $269 one way ATL-IAD in J with AirTrans (no restrictions).
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Traditionally full J and Y have subsidised other leisure travellers. And leisure travellers have subsidised the frequency that full J and Y passengers want. This is why in the past 10% of passengers have brought in 50% of the revenue.