I was wondering the same thing... I really wanted to buy some yarn at a new LYS I just found but felt guilty because I am still working on my baby sweater. Since I haven't yet selected my next project I didn't know how much yarn I would need so I ended up not buying anything. Now I wish I had!
If you find yarn that you really love but don't yet know what you'd do with it , how much of it would you buy?