I agree, that's what's killing meets and headfi in general...
But anyway, it's one thing to acknowledge that it's futile to ask and another to revel in being a selfish ass like it's a right.
Basically, you're arguing that the very reasonable return policy should be removed because they know some people are selfish assholes. I think asking people not to be selfish assholes is a reasonable thing to attempt to do.
I'd do a separate network for the NAS. It depends on how many systems will be connected to it as to whether you need another switch or if you can just direct attach it. I'd be glad to talk to you about options if you'd like.