...collectibility means so many different things to different people.
How true!
Almost no one seems to want a stock SE/30...
I have an SE/30 that I keep "sort of stock." I myself define "stock" differently than most. To me, "stock" means the original machine, but sometimes I will broaden the definition to include "with upgrades that were available in the original era the machine was still selling." So I didn't feel anything icky or hacky about swapping out the ELINA fan in my SE/30 with a more silent Silenx fan (even though Silenx brand fans weren't sold in that era), nor did I feel back about putting in a 4.5GB internal hard drive, 128MB RAM or DiiMO 50MHz 030 accelerator or MacCon Ethernet card. The machine still looks stock and it feels like a "speedy 030 Mac of that era." But some people gut the whole machine and throw in a Mac mini, which I would never do. Such mods are far from stock, according to my definition.
I know several people with 128K macs that say "Macintosh" on the back.
Add me to the list. It's just that the original 128k board is now sitting in the Mac512 upgrade box from Apple, in my closet, while the 512k upgrade logic board rests in the case! It has no red text on back because my machine was built before that era. Since "collectible" is often defined in terms of age, I guess we could say that the older "non-red-text-on-back" Macs would be slightly more valuable/rare than the newer red text versions. But so long as both have the stock 64k ROMs inside, they would be electrically and functionally the same.