Reasons it will need to be perked fairly high?
Its capability. OK so thats number 1. It was a late war attack plane so good at what it did that it hung around for 30 years. For all I know its still being used. Imagine the A-20 with more guns, much faster, and far more maneuverable.
2, Gamewise it would be almost impossible to defend against once it was located. That is unless you have a very fast fighter already up with Altitude. And even then it will be difficult to catch before it drops ords.
3, It will be pure murder on CVs. As a level bomber or, especially, dive bombing and chucking out 36 500lb bombs from a formation. And its so fast it will be very hard to stop.
4, Just as effective for porking fields, VHs, other hangars...ect
5, Most players have so many zillions of bomber perks if the thing aint perked halfway high the A-26 bomb and bailers will screw up the game even more then they do in Lancs. The Invaders get to their target so fast, with so much ord, and if they were perked at 10 points these same clowns will chuck them away as fast as they do their Lancs.
6, Lastly they will have a huge impact on GV'ing. Most of all tanks. I might kill a lot of tanks but I do it with gunnery, from a very slow airplane. A good dive bomber, in such a fast maneuverable plane, with so many 500lb bombs, will impact the GV game a great deal. You can just plain upp them and get them to targets so quickly, with so much TnT..... The Invader really would have to be controlled with perk price or it would just ruin GV'ing. Even a single will hold 12 500lb bombs.
So a light perk price would be out of the question I would think. I believe the A-26 would impact the game even more then the B-29 would. It would be a pure killer no doubt.