Why Opt Out?
There are a fair number of oft-made ships I really don't need a seventh or twelfth copy of, for one thing. How many Enterprise-D or Klingon bird of prey or Reliant's does one person really need?
If I could do such - skip over those? - I would. Less because of the expense more because... I just don't care about those ships anymore. I literally have the 1701-D in every size from the tiny micro ornament that's about 2-3 centimeters in size, to micro machine, to model, up through a 6 foot long inflatable pool raft. I could lay them all next to each other, all 20-odd of them, and it would look like those stacking doll things, you know? :P
Anyway, the reason I'd like to not waste the money on the Abramsprise is simply... I don't like it. Not enough to pay $20 for it, let alone $37 for a bigger copy.
I, like I think a great many people, are enthusiastic about this line of ships not because we get a new 1701-D or Romulan Warbird or Bird of Prey or 1701-A. But because we finally get an Akira, and a Borg Sphere, the Equinox, the Prometheus, the Dominion battle cruiser, and a whole boat load of one-off ships we've never seen. That's why I signed up. And I think a lot of others did so for the same reason.
We've all got 6 or 10 or 20 versions of the big hero ships they make over and over and over and over and over again. What we WANT is the ones we've never been given before. :9