I think that you are missing the point. It’s wise to spend money strategically. What the NRSC did was yank even moral support form O’Donnell - and all of us that are fed up with the status quo. Not to mention that they gave O’Donnell’s Dem opponent a huge talking point for the campaign.
The NRSC’s decision here seems to follow a pattern - noticed and commented on by other posters - of disconnect from the rank and file.
I understand that the timing of the announcement (via leaked sources *coughs* Rove) sucked. Tactically, the NRSC shouldn't spend on this race... YET....
But think about the impact of their announcement. It has FR and the Tea Party in a tizzy. I bet O'Donnell is not hurting from the money bomb she gets today. Let's leave it at that.