Interesting. Did you buy it regularly, or through the App store?
Wonder if the App Store isn't setup to do Delta style updates......and that it has to replace the whole program, like iOS.
I bought it originally in the App store.....so I'm guessing that I wasn't going to get it offered through Software Update.
I hope Lion unifies the update process. I like Software Update because it can check on a schedule. The App Store has to be open....I just happened to open it tonight.
-Kevin