Total weight savings: just under 10 grams. Which is actually more than I would expect, but that's what you get if you calculate it out. Worth the trouble? Well, it's not much trouble, so if you want me to do this for you, just ask.
Terrible, terrible graphics on that seat collar, though. I might have to polish it up.
For those who are confused, more on sleeving seat tubes here and here. This is the method I use on all frames with 28.6mm seat tubes, just FYI.