You are a lucky girl with 11 family quilt tops given to you. There are pros and cons to the question of wheter to finish a quilt top.
The first thing to consider is what is important to you personally and it soulds like you want to finish them..
The next thing to consider is whether the fabrics will hold up to the quilting process. If the top was made of cotton fabrics from the 1930s on, you most likely will have no problem quilting and using them. If they have fabric from 1900 and before, you must be very careful. I hand quilted some blocks like this and the fabric split right along the quilting. So, consider carefully if the fabric will hold up. Any fabric from this period that has black or brown in it was made with a metal mordant, causing the fabric to be brittle. Even some indigos from this period will not hold up. And machine quilting them at this point is definately going to cause rapid deteriozation.
The other thing to think about is how it would have been finished in its time. Most silk quilts from the victorian era were not quilted, but tied to a backing from the back and finished with a binding. Quilting a silk quilt from this time period would definately be too stressful on the fabric. If you tied it to a silk backing with no batting and put a binding on, you could at least display the quilt. On more caution about the silk quilt, DO NOT hang this quilt. The silk will not hold up to hanging either by a sleeve or even draped across a rod or bar. Display this one flat for short periods, then put it away to rest.
As for the monetary value, you should determine that first before doing anything. In making this decision, you should consider the historical nature of the quilt top. Not all quilt tops are significanly historic, but the ones that are need to be preserved for the historic aspect, whether that is the fabric, design, or even the method of construction. All the other thousands of unfiinshed quilt tops that are family heirlooms would not be diminished by being finished and even used.
The last thing I would like to share with you is that , no matter what you decided to do, please make a label with the names and history of the quilt for later generations.
Feel free to PM me if you want to discuss in detail the quilt tops you are working with