How Much Is So Much?

A while back, I noticed myself saying, "thank you so much," and paused to wonder what it meant. SO much? How much is SO much? Then I wondered why I was saying something that actually did not mean anything. Then I realized that Todd Mundt and Charity Nebbe kept saying exactly that during the WUOM fund drives. I must have picked it up from them. Then I stopped saying it for a while, and realized that I kind of missed it. So now I say it again, even though I normally eschew meaningless constructions.