You are not supposed to waste fuel climbing to 20K with it. You fly low at the best cruising speed until you get into the enemy-controlled space, then get to max speed, pop up, drop the bombs and run.
Of course you are not supposed to stage long-range raids like B17 in a tactical bomber.
As for the actual perk cost, It will surely be adjusted.
Nevertheless, the perkier the plane, the less it would pay for itself. The same damage done by a lesser plane should, bring you more points. So you fly in a 70 point plane and come back with 1 perk point - so you have to fly 70 times and live to pay for it.
I guess the idea is not to use perk planes to earn perk points, but to use them in critcal situations where nothing else can do the job as well regardless of the cost - like bombing that brige and stopping the enemy advance.
Otherwise the perk-planes would be self-propagating. On balance people should be supposed to spend the perk ponts while flying perk planes, not earn more of them. Then the system would be self-balancing.
miko
[This message has been edited by miko2d (edited 03-09-2001).]