I did keep track of my yarn purchases in my planner during 2006. Please note that during 2006 I discovered Lorna's Laces and behaved like a sailor on shore leave, and that explains the damages. Rounding up, it was $950. On top of the existing stash of eBay and Elaan scores, and other crap that was not the glorious Lorna's Laces that already lived here. Throw in a generous $150 for knitting book purchases (I dropped all of my magazines and hardly bought any off the rack) and I'll call it $1100 for the year. Not a horrifying number. One I can live with for my numero uno hobby. But the quantity of yarn in the house is enough to keep me busy for months and I do not need to add to it.
Now, on to the books. Because while moving the yarn stash may be embarrassing, moving the books is really freaking expensive, OhMyGawd they are heavy. So the real sacrifice, for the next 90 days - no new books. I have enough to keep me busy during the window of time left for reading. I can keep a list of the books I want to read and buy them later, after I have offloaded pounds of reading material to places that can use it.