Very interesting considerations, thanks.
Only in the last months, when I noticed I had 57 OOP sets on 99 (minus the Davis LPs), I started thinking - like a joke, in the beginning - to complete the collection.
For Dave James: Yes, the sets I "dislike" were a problem also for me: but I had some bad surprises also from issues I was waiting from their announcements (the second Hodges, i.e., please don't kill me); so I'm open to any surprise... Thanks for the Quebec/Hardee info!
For cliffpeterson: yes, you are right: it's certainly the case of the Kod Ory set, and I think also of the earlier Bechet. This is perhaps the reason why the Commodores and the Nat King Cole big sets, expensive also as new, are not so rare: they often surface on Ebay. There are also some "myths", like the two Roulette Basie: I paid an high price for both, thinking them were scarce, that isn't, as it seems after a lot appeared on the Bay.
For Bfrank: In effect, the Manyard Ferguson can be a case similar to Basie.
Thanks again all, and forgive my english