I think you have to distinguish between GFCs and other peds. I have a few Bethlehems, Northfords, and White Mountains for example that were purchased off the rack.
I like the idea of putting together a non-GFC collection. My Tales from the Crypt set (4 books short of completion) is all 8.0+ (except for COT 17, which is 7.5) and only includes 3 GFCs.
I like the idea of high grade EC's, GFC or no (I just want a GFC eventually, to say I have one! Preferably, horror or sci fi.) But I do have a nice White Mountain Vault 20, and love it -- and a Bethlehem Panic #2. I do love non-Gaines EC pedigrees, just wish I had more!
Let's see that Vault 20!