Everything mentioned here is possible. Opt out of the NuPrise special issue and cancel your subscription and buy the issues individually either through a comic shop or their online site.
I understand where you're coming from, but what you're suggesting is very much possible. I don't think it's fair to continually state that it's not possible when, in fact, it is possible, but simply requires a little extra work of ordering the issues individually.
It's possible - but it's a shitload more complicated and time-consuming and delaying to do. So... why would anyone do that?
Subscription = no effort, no thought, auto-bill and delivery.
Canceling = monthly effort, monthly thought, monthly shipping fees (because unless you life in a major city you don't have a store you can buy these things at) and... yeah. That's just... no.
Now if they had a website where you could log-in and check off an "opt-out" button on a ship-by-ship basis? I'd love that. I'd do that.