I like the idea Sami. Perhaps one could fit it with a bidding system à la "Willing to pay up to 625,000 USD per month for A320-200 not older than 10 years old" ... Just a thought.
Generally the used market is risky, as you quickly pay more for a 7 years-old A320 than for a brandnew one on lease fees, as plane prices tend to exceed their values enormously sometimes. This may seem fine at the beginning, but if you face fierce competition that monthly difference of say 100,000 USD or more can make the difference.
Also, don't get used to the high profit margins we currently enjoy. It may all seem workable, as the current attitude seems a bit, any plane, any route - profit! That will not last for very long.
And as soon as we are clinching around at some 7% profit margins (or less), engine comm. can make a difference of some 100,000 USD per month as well. Correct is that the sub-engines do not play any role yet in cost differentiation.
It may be that people clicking F5 regularly may have an advantage; however, that advantage will probably cease after a few days, as deliveries for the first brandnew jets kick in. At least, that is what happened in MT2 after around one week.