I know EXACTLY what you mean! It's so difficult to pass up buying new patterns, fabric, you name it! Right now I have so many UFO's that it's crazy, and I have somewhat committed to working on several of them as they are close to being done anyway.
However, with that said, look at it as an investment, you know, for retirement. If you retire and don't have lots of money to spend on quilt stuff, you can dig thru your stash! When you consider that fabric prices are going up, up, up, this make a TINY BIT of sense!