Some of these HOF arguments are remarkably obtuse. The underlying platform selected for custom chips should not matter in the least (and does not to me whatsoever).
Ceramics (regardless of manucturer), compression clays (regardless of manufacturer), and plastics (regardless of manufacturer) should all compete equally. View each end-product and all of it's components (design, cohesion, beauty, functionality, etc.).
CPC custom clay sets (1000's of them made) definitely hold no high ground here, nor do inexpensive custom sets (ceramic or otherwise) deserve a lower class status (also 1000's made).
Anybody lucky enough to have made a custom set through TRK, Paulson, BCC, Abiatti, Matsui, or GOCC (all with much smaller produced custom set numbers) may have something that is 'more exclusive' than custom sets from Chipco, PGI, Sun-Fly, BRPro, Burt/ASM/CPC, Eastony, or Tina, but that doesn't make them better, more desired, or more worthy of HOF consideration simply because of material or origin.