Self Control?

While on the quest for a gift for a friend for her birthday, I stumbled upon a major deal at one of my favorite places to buy yarn...20% off all the yarn you could fit on one of those reusable shopping bags. Gah!!!!!

Boy, the stash building impulse was crazy strong. I ran through all of the rationalizations that normally let me buy yarn...See if any of these sound familiar:

"Gee, but if I bought the yarn to make this project for (fill in assorted
family member) for (insert holiday here) then I would be saving
us money in the long run..."

or

"But this may be the last time I ever find (fill in the name of a most luscious
yarn) in (fill in the name of a most luscious colorway) in a big enough quantity
to make (most awesome thing found on Ravelry in the last 72 hours) at such an amazingly low price".

Yep. It turns into your own personal Mad Libs of yarn justification. Just insert your favorite wooley words and you can almost talk yourself into any yarn purchase if you think even the smallest bit like I do. It's a truly amazing phenomenon.

With much gnashing of teeth and wringing of hands, I managed to leave the store with only what I came in for, a gift for my dear friend. Its a rare thing, but I still managed it. Ah, one small victory over the stash building impulse. The never ending battle.

What do you stash and why? What keeps you from stashing? How do you justify it either way?