Scott McCloud would be proud!

You are using semantics to justify an untenable position. Because the name of the product is the same as the original with a number after it, you declare that it is the same product. What if they'd called it "Tweetie Pro" instead of "Tweetie 2"? Or how about "Tweetie Plus" or "Tweetie Deluxe"? Would you demand a reduced price for current users in that case? What if they called it "Tweetastic -- from the makers of Tweetie"?

We'll just have to wait and see how much goodwill they lose from malcontents who mutter "worst...upgrade...EVER!" as they click the "purchase" button.

Starslip Crisis: A lot like that other strip you love, but better.
Space: The final premiere.
Starslip Crisis: We're not exactly sure what's going on, either.
Starslip Crisis -- because comedy should make your brain hurt.

Starslip Crisis: Retcon THIS!

And, to riff off an earlier commenter:
Starslip Crisis: It kicks ass... but is it ART?