Come on Netflix!
You could spend that money on some great series that died before their prime.
Pushing Daisies.
Firefly
Or even Journeyman! The actors of this show could easily open up their schedule to re-launch the show.
Fucking Gotham? Seriously?
I think you're underestimating how busy these actors' schedules are (especially for something like Firefly) as well as how much of a pay cut would be necessary for these guys to all abandon whatever gigs they have now for something that was already cancelled once before. It was nearly impossible to get everyone back together for Arrested Development (the whole cast was only able to share the same set for one or two scenes) and that's something with a shit ton of more acclaim and goodwill behind it than anything you listed.
I do think Netflix is going to look back on this move as a major mistake though...I mean, who knows, maybe the show turns out to be something amazing. But so far it doesn't look too hot, pilot reviews have been more lukewarm than anyway, and the only reason they're springing for this is because they see a Batman TV series and their eyes light up with dollar signs.