To the OP, I think this is an interesting argument.
Have you factored in the loss of enhancement mats from losing rank? It may be marginal, but it will prevent your ships from leveling up at the same rate as others.
Have you factored in the loss of ability to do certain challenges faster? This should harm the ability to level up ships and level up their abilities. I don't believe it will hurt you on enhancement droids, although you will have less - I am FTP and don't run out of them.
I think you also may want to assume for calculation purposes that many F2P who are serious about ships will be farming Plo Koon's ship. That may modify your calculations somewhat, maybe in your favor.
