I agree that thread lasts a long time. If not, then all the clothes we wear that are over a year old would have fallen apart at the seams by now. I have a 70-year old quilt, the fabrics have frayed, but the threads at the seams and borders were still intact.
Nah, she's trying to drum up business for the LQS. She could be a tightwad and would probably pick up all the threads thrown away for her own use (jmho).