As for the 'intended' market, I think the real market that WHV was going for was anyone who would buy them. I always considered the GCs as being directed at general consumers (although pricier consumers).
Looney Tunes DVDs, in general, were a test at the very beginning. So in a sense you may be correct. However, the Goldens were released at a time when it was revealed WHV intended to restore the entire library; their format and release strategy made them the obvious outlet for that effort once it became clear they would sell. General consumers were targeted with the Spotlight Collections, released concurrently with (and taking material from) the Goldens.
I dont consider unrestored bonus cartoons that are later restored for the main feature to be "double dips", nor do the majority of collectors.
Kevin's right. When a fully restored cartoon is part of the program material, only then has it been issued. If it appears again in program material for another series, it's a double dip. If it appears as an extra (restored or not, related to the program material or not), it's just an extra. Nothing else.