I'm another one that doesn't sell her work. As I say, I give freely but I don't work for nothing.
But as the others have said, most people simply have no idea of the cost of materials or the cost of time it takes. We can try and educate them but it doesn't really matter, when it comes down to cost, people would rather pay for a coat from China than a coat made in the United States, whether that is hand made or factory made.
Even though my son knows the work/time involved in a quilt, he still doesn't understand the cost of the materials. Same for the most part with my hubby, but we've discussed this sort of thing before. A couple of years ago his brother asked if I would make him a patriotic quilt based on seeing a picture the hubby posted of the one I had just completed for me. I made what I thought was a very generous offer, that I would sell him the completed top for the cost of the materials to replace it, so $100 buying on sale (which didn't include cost of batting, thread, or the stencils I bought for the original top). He said that was too much... I said no problem and kept my quilt.
I do make quite a number of donation quilts, and that's largely because they come from my stash and/or because I'm lucky buying fabric at thrift stores for $1-2 a yard. I had donated one of the baby quilts to the charity auction thing hubby has at work, he was so proud to report it raised $20, and then was shocked to find out that full cost material price for that one would have been about $60, although my true cost was probably closer to $25. Oh well, someone got a bargain if they didn't know/understand. But I don't donate quilts to that anymore either
Edit: Forgot my usual line about this subject: What people don't understand is they are paying for art, when what they want to pay for is a poster (and posters aren't cheap any more either!). My quilts, even the simple ones, are unique. While I might use the same block design, I never make an exact duplicate.