So does FL7 cost to upgrade?
Lifetime free upgrades! v5 -> v6 -> v7 -> v8 -> etc etc for free! Hurrah!
It only costs if you're going to 'move up' through the different 'content packages' - from Express Edition -> Fruityloops Edition -> Producer Edition -> XXL Edition.
Oh... and I've just taken the time to read Cygnus' post before I hit the 'Post' button... and he's just said exactly that.
In the words of my UK pals: I'll get my coat...