I am truely astounded by how many posters in this thread have their wife hold the purse strings. Perhaps it is time for the first lady to also be the commander in chief.
Personally, I would have gone with the approach "Honey, I know you think I have an obsession with diving, but I cant help myself, you are right, I am addicted, we should get a divorce and you should move on. Find yourself a good man, an honest man, one that doesnt have this terrible affliction. OMG, I wish I was a gambler, a wife beater, a drunk, anything instead of a diver."
OTOH
I was in the fortunate position where my wife called my scuba gear "that junk in the back room" and didnt know the difference between an HID and a loofah, oh yeah, and it is a dry suit because it had to be drycleaned.