I imagine that hair could be too fine.. I am not a wig maker but they would have to do something to get the hair to stay in the wig and I can see very fine hair being hard to work with in that regard.
kitoriley's Life List
1. donate hair to Locks of Love
your BBB report is over 3 years old. Here is the current one.
Not all hair is going to be usable. They try to make all the wigs long so the child can have it styled the way they would like and a style that looks good on them.
I have no problems at all with them selling my hair if it does not work for what they are trying to do. As long as the the money is there to help with other things like the machinery I am sure they need or to pay the staff members.
When I donate something .. I feel like its theirs to use as they best see fit.