See, using blobs to downgrade easily to another iOS was stopped by Apple with the advent of iOS 5 (and it's new method of saving/using APTickets). With iOS 5 (and newer), blobs were no longer any good (why save 'em if you can't downgrade, right?). Or - that's what we thought.
The, the ability to re-restore to iOS 5.1.1 was discovered and released. It worked by allowing you to use iOS 5.1.1 blobs to put a fresh iOS 5.1.1 on your iPad - as long as you hadn't already moved up to iOS 6.
The question then becomes: what's the big deal; who cares that you can re-restore to iOS 5.1.1? Well, without that re-restore ability, if you borked up your iPad badly enough to require a restore, the ONLY option available was to go to iOS 6 (as Apple had closed the signing window and SHSH blobs could no longer get you back to the previous iOS). In other words, if you messed up your jail break by installing a bad tweak or whatever, you HAD to move to iOS 6 in order to get your iPad working again - thus losing the jail break. The discovery/release of the re-restore made it so you didn't have to be so protective of yur jail break - we didn't have to worry that a restore would make us lose our jail break.
What I am hoping is that "they" can discover a re-restore for iOS 6.1, our newest jail breakable firmware. It's fine now, what with Apple signing iOS 6.1. But - once they stop signing (approving) this version, you'll be in the same boat as we were in back on iOS 5.1.1 - mess up the jail break and have to restore = moving off of a jail breakable firmware.
So, having blobs for iOS 5.1.1 made it so you could take advantage of the re-restore tool. Not having those blobs meant you couldn't (as well as you needed an iPad that had iTunes installed iOS 5.1.1, not one installed over-the-air or from the factory).
As i said, there is no re-restore tool for iOS 6.1.1 - yet. Doesn't mean I'm not hoping for one. So, i'm saving all the blobs I can (as soon the tools to do so are released). Even if it seems no point now, we never know what the future brings - and it's easy to do, anyway.
So, save 'em cause you just never know...
I hope this clarifies things. Do let me know if you need more pontificating... :)
I got it all now! Thanks a lot Marilyn, I finally understand, you're really very very kind, thanks for helping me out!