Perks. Pfft.
This ought to make everyone, especially HTC, happy...
B-29s cost $15 each; charged to your account the moment your start the sortie. If you bring it back you get $5 returned for the deposit, but Dale & Co keeps the other $10.
Nooks cost $100 each, charged to your account the moment you start the sortie. You don't get that back, even if someone shoots you and your nook down before you get to your target. A nook will destroy every building within a certain radius and can only be dropped from 30,000+ AGL. The radius is slightly smaller than a large airfield. Airfields recover at the same rate, so you could have done the same thing with Lancs.
Three aircraft formation complete with nooks: $345. Go play.