If these tops are up to 100 years old and were machine quilted, the machines themselves would now be considered antique, and if you have one that still works, you have something special. IMHO, you would truly have to be a purist to turn your nose up at a 100 year old quilt whether it was quilted by hand or by machine.
I would suggest you contact some of the quilt museums and ask them about appraisers / conservators. You might be asked to contribute one of these quilts to the museum. Then you know they will be appreciated and cared for in the future. Several Universities have quilt collections, too.