I own at least one ship of every ship released thus far. I own 130 to 140 ships.
At near-perfect efficiency, it will cost me 2.14 cents per ship to upgrade to 2.0. This includes a core set, four Conversion Kits at $50, and two CKs at $30 (First Order and Resistance; guessing on price). It is counting retail prices. (It is not counting Epic. It's also not counting third-party accessories, some of which will not be usable or valuable with 2.0 in existence.)
Near-perfect efficiency is unlikely, though I have started collecting data from players in my region for a Conversion Kit Exchange, to get at least "good" efficiency. But I'm quite willing to say it will cost me $2.50 per ship to convert my very, very large collection.
I simply cannot see how $2.50 per ship is unreasonable. I have read every argument people have made in the forums against it, and every argument against it is just plain silly. $2.50 per ship so that I can continue playing with the 140 miniatures I love, and a game engine that I love, with a vastly improved rules-set? And people think that's just too much? A "money grab"? "Milking cash" from our wallets? Are you serious?
I am frankly shocked that FFG did this with such incredible mindfulness for fairness and reasonableness of cost. That people can't see and appreciate that is baffling, disconcerting, and (frankly) embarrassing.