I think it's also worth noting that expensive ships like the Slave and the Falcon have a reduced value, some people say because of the large base, but I think it's more likely that numbers on the board matter, and therefore the higher points you go the more any formula breaks down and the more cost reduction you need to slip in to make them worth their cost.
I agree that "-1 Agility on defender at Range 1" is the right way to go with the Tractor Beam, and it should be a system upgrade. So the Defender can tractor the enemy while firing an ion cannon at them if they want.
Making it a system upgrade is an interesting idea, I like that too.
Edit: Making a ship's cost proportional to the square root of it's defense will be balanced at any point range, but the developers probably wanted to avoid having a 70 point Falcon running around the board, for several reasons. (sales figure and game fun being the top 2)
Edited: square root of attack times defense isn't quite right for small numbers of ships, as the digitized step function vs a smooth continuous curve starts to favor the single larger ship. Adjusting only the HPs and scaling that as the square root should be OK though.
5 INTs @ 3HP each would actually be favored to beat 3 INTs @7HP each, all else being equal. So I don't think 31 points is too expensive for a TIE Avenger.
Edited by MajorJuggler