"Why are the studios (at least by what I've read) coming across as such miserable Scrooges"
In my opinion, it's because there's a gigantic disconnect between what the writers see as money they deserve, and what the studios feel is a new deal.
A script pays 21K. A residual for the first reuse of that show pays 10.5K.
But if the network is reairing that on the internet, that 10.5K goes away. But for the internet reuse, the studios offer $250. To a writer, that's a $10,250 pay cut. To a studio, that's $250 for something they've never paid for.
Clearly, I side on the "10.5K" part. Somewhere in the middle is where this will probably end up.
But to answer your question: Why are the studios being so prickish?
Well, I think their Bullying, demanding, walking out - and then attempting to pin the blame on the WGA... all that might have worked in 1988, but the same New Media that the studios want to keep for themselves is the same new media that allows writers to communicate with each other, get their words out in the 'blogosphere, and not be rolled over by the fact that the people they negotiate against have a stranglehold on main stream media.
And because of that, people who are not used to being poked and made fun of, or being called into account for their words and actions, are suddenly finding themselves in the spotlight by a group of people who make fun of things of a living. It's making them testy.
So that's where this is all coming from:
Moguls with thin skins (some thinner than others) are battling cynical writers with short fuses and plenty of time to push their buttons.
Go team cynic!