I know my reasons for having so much "extra" fabric is:
1 - Bought more than I needed because I didn't have a pattern in mind.
2 - Style of fabric (traditional, contempary) that I'm drawn to has changed.
3 - My favorite colors have changed.
4 - Bought fabric for a certain project but could never find the remaining fabric I needed - lost interest.
5 - I fret over a project so much that it takes me longer to complete - therefore I know I'll never get all the quilts made that I have fabric for.
6 - Bought fabric just because I loved it - then discovered it was lust not love.
I really could go on and on for my "reasons" not "excuses", but I think you get the idea. :-D :-D :-D