For me, it's a hobby. I don't know of a (fill in the blank) who keeps track of her hobby expenses.
I do know that so far, I'm giving quilts as gifts and I would have spent $50-$100 for a gift. I am a new quilter and have been buying clearance fabric to "practice" with so I don't have a significant expense in fabric. I have also purchased some wonderful fabric on this board at a decent price.
So far, the two quilts I'm completed were LA quilted, so I did have that expense but overall, I know both would be under $100.00 spent to complete, including LA.
HTH!