Well, I'm the type of person that if I am going to collect something, not only must it be a good example to add to my collection, but it must have some useful qualities. For instance, my 512ke/Plus hybrid. It was worth purchasing/repairing because I have loads of programs on 800k floppies to run, and utilize. I also have an Apple SC20 drive filled with very good programs, like Adobe Illustrator 88, which I can run off the Plus (although it's better when I run it off my SE).
An original-stock 128 would just be a period-piece to add for the sake of adding in my case, hence why a Director's Performa, or a TAM would be a lot more valuable for me.